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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
OFFSET
1,2
COMMENTS
a(n) is 0 for the f-block elements.
CROSSREFS
Cf. A138718.
Sequence in context: A040332 A040331 A040330 * A040334 A040333 A040335
KEYWORD
nonn,fini
AUTHOR
Felix Fröhlich, Apr 22 2018
STATUS
approved