A101648 - OEIS

A101648

Atomic numbers of the metalloids or semimetals on the periodic table.

5, 14, 32, 33, 51, 52, 84

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,1

COMMENTS

If ununhexium and ununseptium turn out to be metalloids, 116 and 117 should be added to this sequence, so I'm not putting the keyword full at this time. The metalloids are sandwiched between the nonmetals and the poor metals on the periodic table.

REFERENCES

The New Encyclopaedia Britannica, 15th Edition, 1991, Volume 15 (Macropedia), Chemical Elements.

LINKS

Table of n, a(n) for n=1..7.

Wikipedia, Periodic table.

Wikipedia, Metalloids.

EXAMPLE

The atomic number of boron is 5.

CROSSREFS

Cf. A099955, alkali metals; A099956, alkaline earth metals; A101647, nonmetals (except halogens and noble gases); A097478, halogens; A018227, noble gases; A101649, poor metals.

Sequence in context: A360487 A023652 A283523 * A265100 A070134 A295344

Adjacent sequences: A101645 A101646 A101647 * A101649 A101650 A101651

KEYWORD

fini,nonn

AUTHOR

Robert Happelberg (roberthappelberg(AT)yahoo.com), Dec 10 2004

STATUS

approved