Phosphorus

Reactive nonmetals · Group 15 · Period 3

Atomic properties

Atomic number	15
Symbol	P
Standard atomic weight	30.974
Classification	Reactive nonmetals
Group	15
Period	3
Block	p-block
Electron configuration	[Ne] 3s2 3p3
Electronegativity (Pauling)	2.19
Common oxidation states	+5, +3, -3

Physical properties

Phase at 20 °C	Solid
Density	1.823 g/cm³
Melting point	44.15 °C
Boiling point	280.5 °C
Discovered	1669
CAS number	—

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