Oxygen (O)

Highly reactive nonmetal, essential for respiration in most organisms.

Liquid oxygen is pale blue and strongly paramagnetic.

Element properties

Atomic number
8
Symbol
O
Atomic mass
15.999 u
Category
Nonmetal
Period
2
Group
16
Block
p
State
Gas
Electron configuration
[He] 2s2 2p4
Electronegativity (Pauling)
3.44
Density
0.001429 g/cm³
Melting point
-218.8 °C
Boiling point
-183 °C

Uses