Strontium (Sr) — Element 38

38 Sr 87.62

Strontium

Element 38 · 87.62 u · s-block

alkaline earth

Produces brilliant red flames in fireworks. Strontium-90 is a dangerous radioactive fallout product from nuclear tests.

Phase (STP)

Solid

Melting Point

777 °C

Boiling Point

1382 °C

Density

2.64 g/cm³

Electronegativity

0.95

Atomic Radius

200 pm

Ionization Energy

550 kJ/mol

Electron Affinity

5 kJ/mol

Discovered

1790 · Adair Crawford

Electron Configuration

[Kr] 5s2