53
I
126.9
Iodine
Element 53 · 126.9 u · p-block
nonmetal
A purple-black solid that sublimes into violet vapor. Essential for thyroid function and used as an antiseptic.
Phase (STP)
Solid
Melting Point
113.7 °C
Boiling Point
184.3 °C
Density
4.93 g/cm³
Electronegativity
2.66
Atomic Radius
140 pm
Ionization Energy
1008 kJ/mol
Electron Affinity
295 kJ/mol
Discovered
1811 · Bernard Courtois
Electron Configuration
[Kr] 4d10 5s2 5p5
Electron Orbitals
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