'+pages+''); $('.stream > div:odd').addClass('bgr_color'); updateHeight('#history'); }); window.activateTabArea = ensure(function(tab, areas){ var parsed = false; var parts = (areas || '').split('/'); window.fsonload = $.inArray('fs', parts) >= 0; if(fsonload){ parts.splice(parts.indexOf('fs'), 1); } var replayMode = false; if($.inArray('replay', parts)>=0){ replayMode = 'replay'; } var noSoundMode = false; if($.inArray('nosound', parts)>=0){ noSoundMode = 'nosound'; } if($.inArray('ns', parts)>=0){ noSoundMode = 'ns'; } var previewMode = null; if($.inArray('p', parts)>=0){ previewMode = 'p'; } if($.inArray('preview', parts)>=0){ previewMode = 'preview'; } if($.inArray('repeat', parts)>=0){ replayMode = 'repeat'; } if($.inArray('r', parts)>=0 || $.inArray('ro', parts)>=0){ replayMode = 'r'; } if(replayMode){ parts.splice(parts.indexOf(replayMode), 1); } if(noSoundMode){ parts.splice(parts.indexOf(noSoundMode), 1); } if(previewMode){ parts.splice(parts.indexOf(previewMode), 1); } if(previewMode){ if(!parts.length){ parts = ['1-14', '999:59']; } } var area = parts[0]; if(tab == 'history' && false){ var page = parseInt(area || '1') || 1; $.ajax({ url: 'https://login.wn.com/recent/json/?pp='+history_pp+'&skip='+history_pp*(page-1), dataType: 'jsonp', success: function(response){ $ensure(function(){ renderHistory(response, page); }); } }); return true; } if(tab == 'global_history' && false){ var page = parseInt(area || '1') || 1; globalHistory.fetchStream(page, '', function(){ updateHeight('#global_history'); }); return true; } if(tab == 'my_playlists' && false){ var page = parseInt(area || '1') || 1; myPlaylists.fetchStream(page, '', function(){ updateHeight('#my_playlists'); }); return true; } if(tab == 'my_videos' && false){ var page = parseInt(area || '1') || 1; myVideos.fetchStream(page, '', function(){ updateHeight('#my_videos'); }); return true; } if(tab == 'related_sites' && areas && matchPosition(areas)){ var seconds = parsePosition(areas); scrollRelated(seconds); return false; } if(matchPosition(area) || matchAction(area)){ parts.unshift('1'); area = parts[0]; } if(tab == 'expand' && area && area.match(/\d+/)) { var num = parseInt(area); if(num < 100){ //FIX ME. 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playShouldStart = null; } }; function loadMoreVideos(playerId, vp, start, finish, callback){ var playlistInfo = playlists[playerId-1]; if(playlistInfo.loading >= finish) return; playlistInfo.loading = finish; $.ajax({ url: '/api/upge/cheetah-photo-search/query_videos2', dataType: 'json', data: { query: playlistInfo.query, orderby: playlistInfo.orderby, start: start, count: finish-start }, success: function(response){ var pl = vp.getPlaylist().slice(0); pl.push.apply(pl, response); vp.setPlaylist(pl); callback(); } }); } if(parts.length == 1 && matchDash(parts[0])){ var pl = vp.getActualPlaylist(); var vids = parseDash(parts[0]); parts = []; for(var i = 0; i < vids.length; i++){ playQueue.push({ 'video': pl[vids[i]-1], 'start': 0, 'stop': null }) } if(vids.length){ if(vids[vids.length-1]-1>=pl.length){ loadMoreVideos(playerId, vp, pl.length, vids[vids.length-1], function(){ if(fsonload){ activateTabArea(tab, parts[0]+'/fs'); }else{ activateTabArea(tab, parts[0]); } var pls = vp.getPlaylist(); vp.playFromPlaylist(pls[pls.length-1]); vp.playVideo(); scrollToPlaylistPosition(vp); }); return true; } } if(playQueue){ playQueueUpdate(); vp.playVideo(); parsed = true; playShouldStart = 0; } } if(previewMode){ var vids = []; var dur = 0; var pl = vp.getActualPlaylist(); area = parts[0]; if(parts.length == 1 && matchPosition(parts[0])){ vids = parseDash('1-'+pl.length); dur = parsePosition(parts[0]); parts = []; }else if(parts.length == 1 && matchDash(parts[0])){ vids = parseDash(parts[0]); dur = parsePosition("999:59"); parts = []; } if(parts.length == 2 && matchDash(parts[0]) && matchPosition(parts[1])){ vids = parseDash(parts[0]); dur = parsePosition(parts[1]); parts = []; } for(var i = 0; i < vids.length; i++){ playQueue.push({ 'video': pl[vids[i]-1], 'start': 0, 'stop': dur }) } if(playQueue){ playQueueUpdate(); vp.playVideo(); parsed = true; } } if(parts.length>1){ for(var i = 0; i < parts.length; i++){ var sel = findMatchingVideo(vp, parts[i]); if(sel){ playQueue.push({ 'video': sel, 'start': 0, 'stop': null }) } } if(playQueue){ playQueueUpdate(); 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if(vp.getCurrentVideo() == playQueue[playQueuePosition].video){ playQueueAdvancePosition(); }else{ playShouldStart = null; } } }, 500); vp.playerContainer.bind('videoplayer.player.statechange', function(e, state){ if(state == 'ended'){ // advance to the next video playQueueAdvancePosition(); } }); vp.playerContainer.bind('videoplayer.player.readychange', function(e, state){ if(state){ updateVolumeState(); if(playShouldStart !== null){ vp.seekTo(playShouldStart); playShouldStart = null; }else{ playShouldStop = null; // someone started other video, stop playing from playQueue } } if(fsonload) { triggerFullscreen(playerId); fsonload = false; } }); } } else if(tab.match(/^wiki\d+$/)){ if(firstTimeActivate){ load_wiki($('#'+tab), function(){ if(area){ var areaNode = $('#'+area); if(areaNode.length>0){ $('html, body').scrollTop(areaNode.offset().top + 10); return true; } } }); } } return parsed; }) window.activateTab = ensure(function(tab, area){ window.activeArea = null; if(tab == 'import_videos'){ if(area){ import_videos(area); 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if(window.history && history.replaceState && document.location.hostname.match(/^(youtube\.)?(\w{2,3}\.)?wn\.com$/)){ if(path == main_tab || path == main_tab+'/' || path == '' || path == '/') { path = basepath; } else if( path.match('^'+main_tab+'/') ){ path = basepath + '/' + path.replace(main_tab+'/', '').replace('--','/'); } else { path = basepath + '/' + path.replace('--','/'); } if(document.location.search){ path += document.location.search; } if(window.lastHistory) { history.pushState(null, null, path); } else if(window.lastHistory != path){ history.replaceState(null, null, path); window.lastHistory = path; } } else{ path = path.replace('--','/'); if(path == main_tab || path == main_tab+'/' || path == '' || path == '/') { path = ''; } if(window.lastHistory != '/'+path){ window.location.hash = path? '/'+path : ''; window.lastHistory = '/'+path; } } }); $('.tabtrigger li a').live('click', ensure(function() { var tab = $(this).attr('id'); if(tab.substring(0,1) == '#'){ var name = tab.substring(1); if(name in menu_names){ name = menu_names[name][0]; } realTab = rev_names[name]; $('#'+realTab).show(); if(window.console && console.log) console.log("Triggering tab: "+name+(window.activeArea?" activeArea="+window.activeArea:'')); var path = name; if(window.activeArea){ path = path + '/' + window.activeArea; } if(tab.match(/#playlist\d+/) || tab.match(/#details\d+/)){ $('.multiple-playlists').show(); $('.related_playlist').show(); $('.longest_videos_playlist').show(); }else { $('.multiple-playlists').hide(); $('.related_playlist').hide(); $('.longest_videos_playlist').hide(); } // start the related script only when the tab is on screen showing if (tab.match(/related_sites/)) { if (mc) { mc.startCredits(); } } window.activeTab = realTab; addHistory(path); setTimeout(ensure(function(){ if(tab.match(/language--/)){ $('.tabtrigger').offscreentabs('activateTab', 'language'); } if(tab.match(/weather/)) { $('.tabtrigger').offscreentabs('activateTab', 'weather'); loadContinent(); } updateMenus(tab); updateHeight(); }), 10); } return false; })); }); -->

Electron shell

In chemistry and atomic physics, an electron shell, or a principal energy level, may be thought of as an orbit followed by electrons around an atom's nucleus. The closest shell to the nucleus is called the "1 shell" (also called "K shell"), followed by the "2 shell" (or "L shell"), then the "3 shell" (or "M shell"), and so on farther and farther from the nucleus. The shells correspond with the principal quantum numbers (n = 1, 2, 3, 4 ...) or are labeled alphabetically with letters used in the X-ray notation (K, L, M, …).

Each shell can contain only a fixed number of electrons: The first shell can hold up to two electrons, the second shell can hold up to eight (2 + 6) electrons, the third shell can hold up to 18 (2 + 6 + 10) and so on. The general formula is that the nth shell can in principle hold up to 2(n2) electrons. Since electrons are electrically attracted to the nucleus, an atom's electrons will generally occupy outer shells only if the more inner shells have already been completely filled by other electrons. However, this is not a strict requirement: atoms may have two or even three incomplete outer shells. (See Madelung rule for more details.) For an explanation of why electrons exist in these shells see electron configuration.

Podcasts:

  • Electron shells Elements 1-18

    An atom is composed of a dense core called the nucleus containing protons and neutrons and a series of outer shells occupied by orbiting electrons An electron shell may be thought of as an orbit that the electrons follow. The closest shell to the nucleus is called the "1 shell" also called "K shell", followed by the "2 shells" "L shell"), then the "3 shells" (or "M shell"), and so on. A valence electron is an outer shell electron that is associated with an atom, and the formation of a chemical bond Each shell can contain only a fixed number of electrons: For the first 18 elements, the valence electrons follow these rules. The first shell can hold up to two electrons, the second shell can hold up to eight electrons, the third shell can hold up to 8 The transition metals vary from these g...

    published: 23 Dec 2019
  • Electron Configuration Diagrams | Properties of Matter | Chemistry | FuseSchool

    Electron Configuration Diagrams | Properties of Matter | Chemistry | FuseSchool Learn the basics about Drawing electron configuration diagrams. Find out more in this video! JOIN US ON PATREON https://www.patreon.com/fuseschool SUBSCRIBE to the FuseSchool YouTube channel for many more educational videos. Our teachers and animators come together to make fun & easy-to-understand videos in Chemistry, Biology, Physics, Maths & ICT. VISIT us at www.fuseschool.org, where all of our videos are carefully organised into topics and specific orders, and to see what else we have on offer. Comment, like and share with other learners. You can both ask and answer questions, and teachers will get back to you. These videos can be used in a flipped classroom model or as a revision aid. Find all of o...

    published: 10 Aug 2014
  • What are Shells, Subshells, and Orbitals? | Chemistry

    In this animated tutorial, I will teach about shells, sub shells, orbitals, energy levels and sub energy levels in chemistry. According to Bohr's Atomic Model, there are fixed paths around the nucleus where electrons revolve just like planet revolves around the nucleus. He called these fixed paths as energy levels or shells. Every energy and shell is divided into sub energy level or sub shell respectively. Every subshell has its own orbitals. Energy levels or shells are represented by n. To learn more about shells, subshells, energy levels, orbitals, watch this animated lecture till the end. Orbit Vs Orbitals: https://youtu.be/x8NheFkMbvE Shapes of Orbitals: https://youtu.be/bdfir8uT06Q SPDF Electronic Configuration: https://youtu.be/haUbAt1UPG8 Quantum Numbers: https://youtu.be/o...

    published: 20 Jul 2020
  • Orbitals: Crash Course Chemistry #25

    In this episode of Crash Course Chemistry, Hank discusses what molecules actually look like and why, some quantum-mechanical three-dimensional wave functions are explored, he touches on hybridization, and delves into sigma and pi bonds. Pssst... we made flashcards to help you review the content in this episode! Find them on the free Crash Course App! Download it here for Apple Devices: https://apple.co/3d4eyZo Download it here for Android Devices: https://bit.ly/2SrDulJ -- Table of Contents Molecules: Clumpy Globs... 0:18 Quantum-Mechanical Three-Dimensional Wave Functions 3:06 S & P Orbital Hybridization 5:27 Sigma & Pi Bonds 7:32 Hybridized Orbitals 5:52 Crash Course is on Patreon! You can support us directly by signing up at http://www.patreon.com/crashcourse Want to find Crash Cou...

    published: 05 Aug 2013
  • Electron Configuration

    005 - Electron Configuration In this video Paul Andersen explains how to write out the electron configuration for atoms on the periodic table. More importantly he shows you why electrons arrange themselves in shells, subshells and orbitals by using Coulomb's law and studying the first ionization energies of different atoms. ANSWERS: Cl - [Ne] 3s^2 3p^5 Ag - [Kr] 4d^10 5s^1 - Did you get [Kr] 5s^2 4d^9? There are a few exceptions to this law. Most of them are found in the f-block metals and they are not of much chemical significance. Music Attribution Title: String Theory Artist: Herman Jolly http://sunsetvalley.bandcamp.com/track/string-theory All of the images are licensed under creative commons and public domain licensing: File:Electron Configuration Diagrams from H to Ne.svg,...

    published: 04 Aug 2013
  • The Electron: Crash Course Chemistry #5

    Hank brings us the story of the electron and describes how reality is a kind of music, discussing electron shells and orbitals, electron configurations, ionization and electron affinities, and how all these things can be understood via the periodic table. Watch this video in Spanish on our Crash Course en Español channel! https://youtu.be/N5apS0tE67c Pssst... we made flashcards to help you review the content in this episode! Find them on the free Crash Course App! Download it here for Apple Devices: https://apple.co/3d4eyZo Download it here for Android Devices: https://bit.ly/2SrDulJ Table of Contents Snobby Scientists 00:43 Great Dane/Bohr Model 01:57 Electrons as Music 04:13 Electron Shells and Orbitals 04:44 Electron Configurations 05:54 Ionization and Electron Affinities 08:17 Per...

    published: 12 Mar 2013
  • Energy Levels, shells, SubLevels & Orbitals

    Energy Levels, shells SubLevels & Orbitals topic made Easy. How are Electrons in the orbitals. Chemistry Topic

    published: 20 Jun 2017
  • GCSE Chemistry - Electron Arrangement #8

    This video covers: 0:43 - The number of electrons per energy level 4:24 - why atoms react / why they lose or gain electrons This video is suitable for: - All tiers - All exam boards - Triple and combined science Related videos/topics: GCSE Chemistry playlist: https://www.youtube.com/watch?v=fN8kH9Vvqo0&list=PLidqqIGKox7WeOKVGHxcd69kKqtwrKl8W GCSE Biology Playlist: https://www.youtube.com/watch?v=--dIBinUdeU&list=PLidqqIGKox7X5UFT-expKIuR-i-BN3Q1g GCSE Physics Playlist: https://www.youtube.com/watch?v=aHVJfRxeAxo&list=PLidqqIGKox7UVC-8WC9djoeBzwxPeXph7

    published: 06 Feb 2019
  • Electron Shells and Electron Configurations

    Electrons occupy only certain fixed energy levels called electron shells. The arrangement of electrons in their shells plays a big part in how an atom will chemically react. https://www.liacoseducationalmedia.com This video is a short excerpt from Shedding Light on Atoms Episode 6: Electron Shells, which is part of the Shedding Light on Atoms series. View the whole program on ClickView, Learn360, and SAFARI Montage. The Shedding Light on Atoms series is aimed at mid-secondary students. It chronicles the history of the development of our ideas about atoms while at the same time teaching students everything that they need to know about modern chemistry. In this episode, we look at how electrons are arranged within atoms in electron shells and at how the Periodic Table is organised to refle...

    published: 16 May 2015
developed with YouTube
Electron shells Elements 1-18
4:41

Electron shells Elements 1-18

  • Order:
  • Duration: 4:41
  • Uploaded Date: 23 Dec 2019
  • views: 184613
An atom is composed of a dense core called the nucleus containing protons and neutrons and a series of outer shells occupied by orbiting electrons An electron shell may be thought of as an orbit that the electrons follow. The closest shell to the nucleus is called the "1 shell" also called "K shell", followed by the "2 shells" "L shell"), then the "3 shells" (or "M shell"), and so on. A valence electron is an outer shell electron that is associated with an atom, and the formation of a chemical bond Each shell can contain only a fixed number of electrons: For the first 18 elements, the valence electrons follow these rules. The first shell can hold up to two electrons, the second shell can hold up to eight electrons, the third shell can hold up to 8 The transition metals vary from these guidelines. You can use the periodic table for the groups 1,2,13,14,15,16,17,18 in order to find the number of valence electrons in the outer shell with the exception of helium. For example, all elements in group two have 2 electrons in the outer shell. Elements in the same period have the same number of energy shells. Period 2 will have two energy shells. So let’s go through the elements Up first is period 1 Element 1 is Hydrogen in group 1 and contains one energy shell and 1 electron Element 2 Helium period 1 group 18 and is the one exception because it has 2 valence electrons in the outer shell Now period 2 which each have 2 energy shells. Lithium found in group 1 has 2 electrons in k shell and 1 valence electron in L Beryllium is found in group 2 and has 2 electrons in k shell and 2 valence electrons in L Boron Is found in group 13 and has 2 electrons in k and 3 valence electrons in L Carbon Is found in group 14 and has 2 electrons in k and 4 valence electrons in L Nitrogen Is found in group 15 and has 2 electrons in k and 5 valence electrons in L Oxygen Is found in group 16 and has 2 electrons in k and 6 valence electrons in L Fluorine Is found in group 17 and has 2 electrons in k and 7 valence electrons in L Neon Is found in group 18 and has 2 electrons in k and 8 valence electrons in L Now let’s move on to period 3 with 3 electron shells Sodium Is found in group 1 and has 2 electrons in k and 8 electrons in L and 1 valence electron in m Magnesium Is found in group 2 and has 2 electrons in k and 8 electrons in L and 2 valence electrons in m shell. Transcript http://www.moomoomathblog.com/2020/01/electron-distribution-elements-1-18.html
https://wn.com/Electron_Shells_Elements_1_18
Electron Configuration Diagrams | Properties of Matter | Chemistry | FuseSchool
4:59

Electron Configuration Diagrams | Properties of Matter | Chemistry | FuseSchool

  • Order:
  • Duration: 4:59
  • Uploaded Date: 10 Aug 2014
  • views: 1299788
Electron Configuration Diagrams | Properties of Matter | Chemistry | FuseSchool Learn the basics about Drawing electron configuration diagrams. Find out more in this video! JOIN US ON PATREON https://www.patreon.com/fuseschool SUBSCRIBE to the FuseSchool YouTube channel for many more educational videos. Our teachers and animators come together to make fun & easy-to-understand videos in Chemistry, Biology, Physics, Maths & ICT. VISIT us at www.fuseschool.org, where all of our videos are carefully organised into topics and specific orders, and to see what else we have on offer. Comment, like and share with other learners. You can both ask and answer questions, and teachers will get back to you. These videos can be used in a flipped classroom model or as a revision aid. Find all of our Chemistry videos here: https://www.youtube.com/playlist?list=PLW0gavSzhMlReKGMVfUt6YuNQsO0bqSMV Find all of our Biology videos here: https://www.youtube.com/playlist?list=PLW0gavSzhMlQYSpKryVcEr3ERup5SxHl0 Find all of our Physics videos here: https://www.youtube.com/playlist?list=PLW0gavSzhMlTWm6Sr5uN2Uv5TXHiZUq8b Find all of our Maths videos here: https://www.youtube.com/playlist?list=PLW0gavSzhMlTKBNbHH5u1SNnsrOaacKLu Instagram: https://www.instagram.com/fuseschool/ Facebook: https://www.facebook.com/fuseschool/ Twitter: https://twitter.com/fuseSchool Access a deeper Learning Experience in the FuseSchool platform and app: www.fuseschool.org Follow us: http://www.youtube.com/fuseschool Befriend us: http://www.facebook.com/fuseschool This is an Open Educational Resource. If you would like to use the video, please contact us: info@fuseschool.org
https://wn.com/Electron_Configuration_Diagrams_|_Properties_Of_Matter_|_Chemistry_|_Fuseschool
What are Shells, Subshells, and Orbitals? | Chemistry
6:00

What are Shells, Subshells, and Orbitals? | Chemistry

  • Order:
  • Duration: 6:00
  • Uploaded Date: 20 Jul 2020
  • views: 1143255
In this animated tutorial, I will teach about shells, sub shells, orbitals, energy levels and sub energy levels in chemistry. According to Bohr's Atomic Model, there are fixed paths around the nucleus where electrons revolve just like planet revolves around the nucleus. He called these fixed paths as energy levels or shells. Every energy and shell is divided into sub energy level or sub shell respectively. Every subshell has its own orbitals. Energy levels or shells are represented by n. To learn more about shells, subshells, energy levels, orbitals, watch this animated lecture till the end. Orbit Vs Orbitals: https://youtu.be/x8NheFkMbvE Shapes of Orbitals: https://youtu.be/bdfir8uT06Q SPDF Electronic Configuration: https://youtu.be/haUbAt1UPG8 Quantum Numbers: https://youtu.be/oOVLkiBnq6o #Shells #EnergyLevels #Subshells #Chemistry Subscribe my channel at:https://www.youtube.com/channel/UC_ltCdLVMRZ7r3IPzF2Toyg Youtube link: https://www.youtube.com/channel/UC_ltCdLVMRZ7r3IPzF2Toyg Facebook link: https://www.facebook.com/Najamacademy/
https://wn.com/What_Are_Shells,_Subshells,_And_Orbitals_|_Chemistry
Orbitals: Crash Course Chemistry #25
10:52

Orbitals: Crash Course Chemistry #25

  • Order:
  • Duration: 10:52
  • Uploaded Date: 05 Aug 2013
  • views: 3246654
In this episode of Crash Course Chemistry, Hank discusses what molecules actually look like and why, some quantum-mechanical three-dimensional wave functions are explored, he touches on hybridization, and delves into sigma and pi bonds. Pssst... we made flashcards to help you review the content in this episode! Find them on the free Crash Course App! Download it here for Apple Devices: https://apple.co/3d4eyZo Download it here for Android Devices: https://bit.ly/2SrDulJ -- Table of Contents Molecules: Clumpy Globs... 0:18 Quantum-Mechanical Three-Dimensional Wave Functions 3:06 S & P Orbital Hybridization 5:27 Sigma & Pi Bonds 7:32 Hybridized Orbitals 5:52 Crash Course is on Patreon! You can support us directly by signing up at http://www.patreon.com/crashcourse Want to find Crash Course elsewhere on the internet? Facebook - http://www.facebook.com/YouTubeCrashCourse Twitter - http://www.twitter.com/TheCrashCourse Instagram - https://www.instagram.com/thecrashcourse/ CC Kids: http://www.youtube.com/crashcoursekids
https://wn.com/Orbitals_Crash_Course_Chemistry_25
Electron Configuration
10:17

Electron Configuration

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  • Duration: 10:17
  • Uploaded Date: 04 Aug 2013
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005 - Electron Configuration In this video Paul Andersen explains how to write out the electron configuration for atoms on the periodic table. More importantly he shows you why electrons arrange themselves in shells, subshells and orbitals by using Coulomb's law and studying the first ionization energies of different atoms. ANSWERS: Cl - [Ne] 3s^2 3p^5 Ag - [Kr] 4d^10 5s^1 - Did you get [Kr] 5s^2 4d^9? There are a few exceptions to this law. Most of them are found in the f-block metals and they are not of much chemical significance. Music Attribution Title: String Theory Artist: Herman Jolly http://sunsetvalley.bandcamp.com/track/string-theory All of the images are licensed under creative commons and public domain licensing: File:Electron Configuration Diagrams from H to Ne.svg, n.d. http://commons.wikimedia.org/wiki/File:Electron_configuration_diagrams_from_H_to_Ne.svg. "File:Electron Orbitals.svg." Wikipedia, the Free Encyclopedia. Accessed July 31, 2013. https://en.wikipedia.org/wiki/File:Electron_orbitals.svg. "File:Electron Shell 001 Hydrogen - No Label.svg." Wikipedia, the Free Encyclopedia. Accessed July 31, 2013. http://en.wikipedia.org/wiki/File:Electron_shell_001_Hydrogen_-_no_label.svg. "File:Electron Shell 002 Helium - No Label.svg." Wikipedia, the Free Encyclopedia. Accessed July 31, 2013. http://en.wikipedia.org/wiki/File:Electron_shell_002_Helium_-_no_label.svg. "File:Electron Shell 003 Lithium - No Label.svg." Wikipedia, the Free Encyclopedia. Accessed July 31, 2013. http://en.wikipedia.org/wiki/File:Electron_shell_003_Lithium_-_no_label.svg. "File:Electron Shell 004 Beryllium - No Label.svg." Wikipedia, the Free Encyclopedia. Accessed July 31, 2013. http://en.wikipedia.org/wiki/File:Electron_shell_004_Beryllium_-_no_label.svg. "File:Empirical Atomic Radius Trends.png." Wikipedia, the Free Encyclopedia. Accessed August 1, 2013. http://en.wikipedia.org/wiki/File:Empirical_atomic_radius_trends.png. "File:First Ionization Energy.svg." Wikipedia, the Free Encyclopedia. Accessed August 1, 2013. http://en.wikipedia.org/wiki/File:First_Ionization_Energy.svg. "File:Klechkovski Rule.svg." Wikipedia, the Free Encyclopedia. Accessed July 31, 2013. http://en.wikipedia.org/wiki/File:Klechkovski_rule.svg. "File:Periodic Table 2.svg." Wikipedia, the Free Encyclopedia. Accessed July 31, 2013. https://en.wikipedia.org/wiki/File:Periodic_Table_2.svg. "File:Periodic Trends.svg." Wikipedia, the Free Encyclopedia. Accessed August 1, 2013. http://en.wikipedia.org/wiki/File:Periodic_trends.svg. "File:Periodic Variation of Pauling Electronegativities.png." Wikipedia, the Free Encyclopedia. Accessed August 1, 2013. http://en.wikipedia.org/wiki/File:Periodic_variation_of_Pauling_electronegativities.png. RJHall. Ionization Energies of Neutral Elements, in Units of eV., October 10, 2010. File:Ionization energies.png. http://commons.wikimedia.org/wiki/File:Ionization_energies.svg.
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The Electron: Crash Course Chemistry #5
12:48

The Electron: Crash Course Chemistry #5

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  • Uploaded Date: 12 Mar 2013
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Hank brings us the story of the electron and describes how reality is a kind of music, discussing electron shells and orbitals, electron configurations, ionization and electron affinities, and how all these things can be understood via the periodic table. Watch this video in Spanish on our Crash Course en Español channel! https://youtu.be/N5apS0tE67c Pssst... we made flashcards to help you review the content in this episode! Find them on the free Crash Course App! Download it here for Apple Devices: https://apple.co/3d4eyZo Download it here for Android Devices: https://bit.ly/2SrDulJ Table of Contents Snobby Scientists 00:43 Great Dane/Bohr Model 01:57 Electrons as Music 04:13 Electron Shells and Orbitals 04:44 Electron Configurations 05:54 Ionization and Electron Affinities 08:17 Periodic Table 10:18 Crash Course is on Patreon! You can support us directly by signing up at http://www.patreon.com/crashcourse Want to find Crash Course elsewhere on the internet? Facebook - http://www.facebook.com/YouTubeCrashCourse Twitter - http://www.twitter.com/TheCrashCourse Instagram - https://www.instagram.com/thecrashcourse/ CC Kids: http://www.youtube.com/crashcoursekids
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Energy Levels, shells, SubLevels & Orbitals
3:24

Energy Levels, shells, SubLevels & Orbitals

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  • Uploaded Date: 20 Jun 2017
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Energy Levels, shells SubLevels & Orbitals topic made Easy. How are Electrons in the orbitals. Chemistry Topic
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GCSE Chemistry - Electron Arrangement  #8
6:24

GCSE Chemistry - Electron Arrangement #8

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  • Uploaded Date: 06 Feb 2019
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This video covers: 0:43 - The number of electrons per energy level 4:24 - why atoms react / why they lose or gain electrons This video is suitable for: - All tiers - All exam boards - Triple and combined science Related videos/topics: GCSE Chemistry playlist: https://www.youtube.com/watch?v=fN8kH9Vvqo0&list=PLidqqIGKox7WeOKVGHxcd69kKqtwrKl8W GCSE Biology Playlist: https://www.youtube.com/watch?v=--dIBinUdeU&list=PLidqqIGKox7X5UFT-expKIuR-i-BN3Q1g GCSE Physics Playlist: https://www.youtube.com/watch?v=aHVJfRxeAxo&list=PLidqqIGKox7UVC-8WC9djoeBzwxPeXph7
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Electron Shells and Electron Configurations
5:31

Electron Shells and Electron Configurations

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Electrons occupy only certain fixed energy levels called electron shells. The arrangement of electrons in their shells plays a big part in how an atom will chemically react. https://www.liacoseducationalmedia.com This video is a short excerpt from Shedding Light on Atoms Episode 6: Electron Shells, which is part of the Shedding Light on Atoms series. View the whole program on ClickView, Learn360, and SAFARI Montage. The Shedding Light on Atoms series is aimed at mid-secondary students. It chronicles the history of the development of our ideas about atoms while at the same time teaching students everything that they need to know about modern chemistry. In this episode, we look at how electrons are arranged within atoms in electron shells and at how the Periodic Table is organised to reflect these arrangements. We also demonstrate a variety of experiments and scientific apparatus which led to the discovery of electron shells. The program finishes by taking a brief look at the size of atoms. All of our videos come with worksheets for students, so head over to https://www.liacoseducationalmedia.com today!
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Electron shells Elements 1-18

An atom is composed of a dense core called the nucleus containing protons and neutrons and a series of outer shells occupied by orbiting electrons An electron shell may be thought of as an orbit that the electrons follow. The closest shell to the nucleus is called the "1 shell" also called "K shell", followed by the "2 shells" "L shell"), then the "3 shells" (or "M shell"), and so on. A valence electron is an outer shell electron that is associated with an atom, and the formation of a chemical bond Each shell can contain only a fixed number of electrons: For the first 18 elements, the valence electrons follow these rules. The first shell can hold up to two electrons, the second shell can hold up to eight electrons, the third shell can hold up to 8 The transition metals vary from these guidelines. You can use the periodic table for the groups 1,2,13,14,15,16,17,18 in order to find the number of valence electrons in the outer shell with the exception of helium. For example, all elements in group two have 2 electrons in the outer shell. Elements in the same period have the same number of energy shells. Period 2 will have two energy shells. So let’s go through the elements Up first is period 1 Element 1 is Hydrogen in group 1 and contains one energy shell and 1 electron Element 2 Helium period 1 group 18 and is the one exception because it has 2 valence electrons in the outer shell Now period 2 which each have 2 energy shells. Lithium found in group 1 has 2 electrons in k shell and 1 valence electron in L Beryllium is found in group 2 and has 2 electrons in k shell and 2 valence electrons in L Boron Is found in group 13 and has 2 electrons in k and 3 valence electrons in L Carbon Is found in group 14 and has 2 electrons in k and 4 valence electrons in L Nitrogen Is found in group 15 and has 2 electrons in k and 5 valence electrons in L Oxygen Is found in group 16 and has 2 electrons in k and 6 valence electrons in L Fluorine Is found in group 17 and has 2 electrons in k and 7 valence electrons in L Neon Is found in group 18 and has 2 electrons in k and 8 valence electrons in L Now let’s move on to period 3 with 3 electron shells Sodium Is found in group 1 and has 2 electrons in k and 8 electrons in L and 1 valence electron in m Magnesium Is found in group 2 and has 2 electrons in k and 8 electrons in L and 2 valence electrons in m shell. Transcript http://www.moomoomathblog.com/2020/01/electron-distribution-elements-1-18.html
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Electron Configuration
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Electron shell

In chemistry and atomic physics, an electron shell, or a principal energy level, may be thought of as an orbit followed by electrons around an atom's nucleus. The closest shell to the nucleus is called the "1 shell" (also called "K shell"), followed by the "2 shell" (or "L shell"), then the "3 shell" (or "M shell"), and so on farther and farther from the nucleus. The shells correspond with the principal quantum numbers (n = 1, 2, 3, 4 ...) or are labeled alphabetically with letters used in the X-ray notation (K, L, M, …).

Each shell can contain only a fixed number of electrons: The first shell can hold up to two electrons, the second shell can hold up to eight (2 + 6) electrons, the third shell can hold up to 18 (2 + 6 + 10) and so on. The general formula is that the nth shell can in principle hold up to 2(n2) electrons. Since electrons are electrically attracted to the nucleus, an atom's electrons will generally occupy outer shells only if the more inner shells have already been completely filled by other electrons. However, this is not a strict requirement: atoms may have two or even three incomplete outer shells. (See Madelung rule for more details.) For an explanation of why electrons exist in these shells see electron configuration.

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