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A303149 Group number of n-th element in the periodic table, or 0 if the element does not have a group number. 0
1, 18, 1, 2, 13, 14, 15, 16, 17, 18, 1, 2, 13, 14, 15, 16, 17, 18, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 1, 2, 3, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 4, 5, 6, 7, 8, 9 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

a(n) is 0 for the f-block elements.

LINKS

Table of n, a(n) for n=1..77.

Wikipedia, Block (periodic table) - f-block

Wikipedia, Group (periodic table)

Wikipedia, List of chemical elements

Wikipedia, Periodic table

CROSSREFS

Cf. A138718.

Sequence in context: A040332 A040331 A040330 * A040334 A040333 A040335

Adjacent sequences:  A303146 A303147 A303148 * A303150 A303151 A303152

KEYWORD

nonn,fini

AUTHOR

Felix Fröhlich, Apr 22 2018

STATUS

approved

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Last modified November 29 21:32 EST 2021. Contains 349416 sequences. (Running on oeis4.)