A134982 Number of elements in the n-th column of Medeleiev's periodic system of elements.

7, 6, 4, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 4, 4, 4, 4, 4, 4, 4, 4, 4, 6, 6, 6, 6, 6, 7

Offset: 1

Author

Paul Curtz, Feb 05 2008

Keywords

• nonn
• fini
• full

Comments

a(1)=7 represents Hydrogen and the alkali metals. Ends with a(32)=7 for 7 noble gases. These are the block counts (grouping) of the atomic numbers A134984. - R. J. Mathar, Feb 08 2008

The corresponding row numbers are A093907; the sum over all a(n) equals 118 in both cases. - R. J. Mathar, Feb 08 2008

Comment from Paul Curtz, May 03 2008 (Start):

1................................................................................................................2

3..4.........................................................................................5...6...7...8...9..10

11.12.......................................................................................13..14..15..16..17..18

19.20.21................................................22..23..24..25..26..27..28..29..30..31..32..33..34..35..36

37.38.39................................................40..41..42..43..44..45..46..47..48..49..50..51..52..53..54

55.56.57.58.59.60.61.62.63.64.65.66.67..68..69..70..71..72..73..74..75..76..77..78..79..80..81..82..83..84..85..86

87.88.89.90.91.92.93.94.95.96.97.98.99.100.101.102.103.104.105.106.107.108.109.110.111.112.113.114.115.116.117.118

(End)

Crossrefs

Cf. A134984, A093907, A137583, A135559.

Extensions

Edited by R. J. Mathar, Feb 08 2008