Oxygen

Reactive nonmetals · Group 16 · Period 2

Atomic properties

Atomic number	8
Symbol	O
Standard atomic weight	15.999
Classification	Reactive nonmetals
Group	16
Period	2
Block	p-block
Electron configuration	[He] 2s2 2p4
Electronegativity (Pauling)	3.44
Common oxidation states	-2

Physical properties

Phase at 20 °C	Gas
Density	0.001429 g/cm³
Melting point	-218.79 °C
Boiling point	-182.96 °C
Discovered	1774
CAS number	—

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