د ويکيپېډيا، وړیا پوهنغونډ له خوا
Technetium, 43Tc |
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Pronunciation | /tɛkˈniːʃiəm/ tek-NEE-shee-əm |
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Appearance | shiny gray metal |
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اټومي شمیره (Z) | 43 |
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گروپ, پیریود | group 7, period 5 |
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بلاک | d-block |
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Element category | transition metal |
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Mass number | 98 (most stable isotope) |
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Electron configuration | [Kr] 4d5 5s2 |
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Electrons per shell | 2, 8, 18, 13, 2 |
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حالت (at STP) | جامد |
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دويلې کيدو ټکى | 2430 K (2157 °C, 3915 °F) |
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يشنا ټکی | 4538 K (4265 °C, 7709 °F) |
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Density near r.t. | 11 g/cm3 |
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Heat of fusion | 33.29 kJ/mol |
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Heat of vaporization | 585.2 kJ/mol |
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Molar heat capacity | 24.27 J/(mol·K) |
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Vapor pressure (extrapolated)
P (Pa)
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1
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10
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100
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1 k
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10 k
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100 k
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at T (K)
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2727
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2998
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3324
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3726
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4234
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4894
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Oxidation states | 7, 6, 5, 4, 3,[۱] 2, 1,[۱] −1, −3 (a strongly acidic oxide) |
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Electronegativity | Pauling scale: 1.9 |
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Ionization energies | - 1st: 702 kJ/mol
- 2nd: 1470 kJ/mol
- 3rd: 2850 kJ/mol
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Atomic radius | empirical: 136 pm |
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Covalent radius | 147±7 pm |
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Crystal structure | hexagonal close-packed (hcp) |
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Speed of sound thin rod | 16,200 m/s (at 20 °C) |
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Thermal expansion | 7.1 µm/(m·K)[۲] (at r.t.) |
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د تودوخې تېرېدنه | 50.6 W/(m·K) |
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Electrical resistivity | 200 nΩ·m (at 20 °C) |
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Magnetic ordering | Paramagnetic |
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Magnetic susceptibility (χmol) | +270.0·10−6 cm3/mol (298 K)[۳] |
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CAS Number | 7440-26-8 |
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Prediction | Dmitri Mendeleev (1871) |
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Discovery and first isolation | Emilio Segrè and Carlo Perrier (1937) |
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| references | in Wikidata |
ټېکنېټيوم (په انگرېزي: Technetium) له کیمیاوي عناصرو څخه یو دی چې په تناوبي جدول کې د Tc سمبول او ۴۳ اتمي شمېرې په وسیله ښودل شوی دی.
- ↑ ۱٫۰ ۱٫۱ "Technetium: technetium(III) iodide compound data". OpenMOPAC.net. نه اخيستل شوی 2007-12-10.
- ↑ Cverna, Fran (2002). "Ch. 2 Thermal Expansion". ASM Ready Reference: Thermal properties of metals (PDF). ASM International. ISBN 978-0-87170-768-0.
- ↑ Weast, Robert (1984). CRC, Handbook of Chemistry and Physics. Boca Raton, Florida: Chemical Rubber Company Publishing. pp. E110. ISBN 0-8493-0464-4.
دا ليکنه نابشپړه ده، تاسې ددې ليکنې په بشپړولو کې د ويکيپېډيا سره مرسته کولای شئ.
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