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A138228 Atomic numbers at the top of the 18 groups of the Mendeleyev-Seaborg table A138724. 0
1, 4, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 5, 6, 7, 8, 9, 2 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

COMMENTS

This refers to the following 18 elements at the top of their groups: H, Be, Sc, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, B, C, N, O, F, He.

LINKS

Table of n, a(n) for n=0..17.

CROSSREFS

Cf. A138718, A135559.

Sequence in context: A338421 A329404 A076943 * A303722 A305225 A272954

Adjacent sequences:  A138225 A138226 A138227 * A138229 A138230 A138231

KEYWORD

nonn,fini,full,less

AUTHOR

Paul Curtz, May 05 2008

STATUS

approved

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Last modified June 12 10:58 EDT 2021. Contains 344947 sequences. (Running on oeis4.)