Iodine

Halogens · Group 17 · Period 5

Atomic properties

Atomic number	53
Symbol	I
Standard atomic weight	126.90
Classification	Halogens
Group	17
Period	5
Block	p-block
Electron configuration	[Kr] 4d10 5s2 5p5
Electronegativity (Pauling)	2.66
Common oxidation states	+7, +5, +1, -1

Physical properties

Phase at 20 °C	Solid
Density	4.933 g/cm³
Melting point	113.7 °C
Boiling point	184.3 °C
Discovered	1811
CAS number	—

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