A097478 Atomic numbers of halogens in the periodic table.

9, 17, 35, 53, 85, 117

Offset

1,1

Comments

The halogens are all on the second rightmost column of the periodic table. (The rightmost column belongs to the noble gases.) - Alonso del Arte, Apr 26 2011

From Daniel Forgues, Jul 12-13 2015, Luca Khan, Sep 9 2024: (Start)

Halogens: 9: fluorine (F), 17: chlorine (Cl), 35: bromine (Br), 53: iodine (I), 85: astatine (At) and 117: tennessine (Ts). (End)

References

Monica Halka and Brian Nordstrom, Halogens and Noble Gases, Facts On File (2010), Part 1: The Halogens.

Links

Table of n, a(n) for n=1..6.

Bodner Research Web, The Chemistry of the Halogens

Royal Society of Chemistry, Periodic Table, 2015.

Wikipedia, Halogen

Formula

a(1) = 9; a(n) = a(n-1) + 2 * (ceiling(n/2) + 1)^2, 2 <= n <= 6.

Crossrefs

Cf. A099955, alkali metals; A099956, alkaline earth metals; A101648, metalloids; A101647, nonmetals (except halogens and noble gases); A018227, noble gases; A101649, poor metals.

Sequence in context: A146236 A147279 A173788 * A147026 A055393 A147082

Adjacent sequences: A097475 A097476 A097477 * A097479 A097480 A097481

Keyword

nonn

Author

Parthasarathy Nambi, Sep 19 2004

Status

approved