NO. 038Alkaline Earth

Sr

Strontium

Strontium is a soft metal used in fireworks to produce red colors and in medical imaging.

Crystal Structure

Face-centered cubic (fcc)

Atomic Mass87.62 u

Density2.64 g/cm³

Melting Point1050 K

Boiling Point1655 K

Atomic Radius219 pm

Electronegativity0.95

Ionization Energy550 kJ/mol

Electron Affinity5 kJ/mol

Bonding TypeMetallic

Oxidation States2

Acid/BaseBasic

ReactivityHigh

Electron Configuration

[Kr] 5s2

Discovered ByAdair Crawford

Year1790

Known Isotopes

Sr-84Sr-86Sr-87Sr-88