Iodine (I)

A nonmetallic element that forms a purple gas when heated.

It is added to salt to prevent thyroid problems.

Element properties

Atomic number
53
Symbol
I
Atomic mass
126.9 u
Category
Halogen
Period
5
Group
17
Block
p
State
Solid
Electron configuration
[Kr] 4d10 5s2 5p5
Electronegativity (Pauling)
2.66
Density
4.93 g/cm³
Melting point
113.7 °C
Boiling point
184.3 °C

Uses