Symbol
O
Atomic Number
8
Atomic Mass
15.999
Protons
8
Neutrons
8
Electrons
8
Type
Non-metal
Isotopes
Oxygen-16, Oxygen-17, Oxygen-18
Discovery Year
1774
Discovered By
Joseph Priestley
Group
16
Period
2
Boiling Point
-297°F
Melting Point
-361°F
Electron Configuration
[He] 2s² 2p⁴
Density (g/cm³)
0.001429
Crystal Structure
Monoclinic
Magnetism
Paramagnetic
Abundance in Earth's Crust
46.6%
Phase at Room Temperature
Gas