53
I
iodine
126.90

General properties

Group
group 17 (halogens)
Period
period 5
Category
halogens
Standard atomic weight
126.904 47(3)
Melting point
(I₂) 386.85 K (113.70 °C)
Boiling point
(I₂) 457.4 K (184.3 °C)
Phase at STP
solid

Additional properties

Block
p-block
Electron configuration
[Kr] 4d¹⁰ 5s² 5p⁵
Electrons per shell
2, 8, 18, 18, 7
Electronegativity
2.66
Density
4.933 g/cm³
Oxidation states
−1, +1, +3, +4, +5, +6, +7 (a strongly oxide)
CAS Number
7553-56-2