Symbol
I
Atomic Number
53
Atomic Mass
126.90447
Protons
53
Neutrons
74
Electrons
53
Type
Halogen
Isotopes
Iodine-127, Iodine-129
Discovery Year
1811
Discovered By
Bernard Courtois
Group
17
Period
5
Boiling Point
1841°F
Melting Point
113.7°F
Electron Configuration
[Kr] 5s² 4d¹⁰ 5p⁵
Density (g/cm³)
4.933
Crystal Structure
Orthorhombic
Magnetism
Diamagnetic
Abundance in Earth's Crust
0.000016%
Phase at Room Temperature
Solid