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A138096 Number of elements in the n-th column of the second extension of the Mendeleyev-Seaborg periodic table of elements. 3
7, 6, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 6, 6, 6, 6, 6, 7 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

A variant of A134982, with one term "4" changing place because (relative to the first table) the two elements number 21 and 39 are moved over to the next column of d-metals, placed above element 71.

LINKS

Table of n, a(n) for n=1..32.

CROSSREFS

Cf. A137583, A093907, A134984, A135559.

Sequence in context: A285165 A198925 A260333 * A258010 A011102 A323098

Adjacent sequences:  A138093 A138094 A138095 * A138097 A138098 A138099

KEYWORD

nonn,easy,fini,full,less

AUTHOR

Paul Curtz, May 03 2008

STATUS

approved

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Last modified September 23 04:54 EDT 2020. Contains 337295 sequences. (Running on oeis4.)