Strontium

Alkaline earth metals · Group 2 · Period 5

Atomic properties

Atomic number	38
Symbol	Sr
Standard atomic weight	87.62
Classification	Alkaline earth metals
Group	2
Period	5
Block	s-block
Electron configuration	[Kr] 5s2
Electronegativity (Pauling)	0.95
Common oxidation states	+2

Physical properties

Phase at 20 °C	Solid
Density	2.64 g/cm³
Melting point	777 °C
Boiling point	1377 °C
Discovered	1790
CAS number	—

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