Strontium

Atomic number

38

Atomic mass (u)

87.62

Category

Alkaline earth metal

Standard state

Solid

Melting point

776.85 °C (1050 K)

Boiling point

1381.85 °C (1655 K)

Density (g/cm³)

2.64

Electronegativity (Pauling)

0.95

Electron configuration

[Kr]5s2

Oxidation states

+2

Atomic radius (pm)

249

First ionization energy (eV)

5.695

Discovery & recognition

Discovery year / period (PubChem)

1790

Discovery credited to (RSC)

Adair Crawford

Date or period recorded by RSC

1790

Discovery place

Royal Institution, London (metal isolation); source mineral from Scotland

An ancient date does not identify a first human discovery. Different references may date observation, isolation and formal recognition differently.

Natural occurrence & production

The creation of an element’s nuclei and its concentration into terrestrial deposits are different processes. The occurrence note below concerns its presence or production on Earth; it is not a complete account of nucleosynthesis.

“Strontium is found mainly in the minerals celestite and strontianite.”

Royal Society of Chemistry · occurrence excerpt ↗

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Reference values are not product specifications. Blank values have not been estimated. For superheavy elements, some properties and family assignments are theoretical or incompletely measured.