A303149 Group number of n-th element in the periodic table, or 0 if the element does not have a group number.

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

Author

Felix Fröhlich, Apr 22 2018

Keywords

• nonn
• fini

Comments

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

Links

• Wikipedia, Block (periodic table) - f-block
• Wikipedia, Group (periodic table)
• Wikipedia, List of chemical elements
• Wikipedia, Periodic table

Crossrefs

Cf. A138718.