Iodine

Halogen

Lustrous violet-black solid; sublimes to violet vapour; starch test.

Electronic Configuration

[Kr] 4d¹⁰ 5s² 5p⁵or1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 4d¹⁰ 5s² 5p⁵

Electron shells

2e⁻

n=1

8e⁻

n=2

18e⁻

n=3

18e⁻

n=4

7e⁻

n=5

Atomic number

Atomic mass

126.9 u

Category

Halogen

Block / Group / Period

p · 17 · 5

Valence electrons

Oxidation states

-1 to +7

Electronegativity

2.66

Atomic radius

115 pm

Ionization energy

1008 kJ/mol

Electron affinity

295 kJ/mol

Melting point

387 K / 114 °C

Boiling point

457 K / 184 °C

Density

4.93 g/cm³

State at 25 °C

solid

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