Periodic Table of Elements

38

Strontium

87.62

Strontium was discovered by an Irish chemist, Adair Crawford, in 1790. But it was not until 1808, that Strontium was first isolated by Sir Humphry Davy, an English chemist. Strontium was named after the village of Strontian in Scotland.

Name: Strontium
Symbol: Sr
Atomic number: 38
Atomic weight: 87.62
State: solid
Group, period, block: 2, 5, s
Color: silvery white metallic
Classification: alkaline earth metal
Electron configuration: 5s2
2,8,18,8,2

Physical properties

Density: 2.64 g/cm-3
Melting point: 1050 K,777 C,1431 F
Boiling point: 1655 K,1382 C,2520 F

Atomic properties

Oxidation states: 2, 1,[1]
Electronegativity: 0.95 (Pauling scale)
Ionization energies: 1st: 549.5 kJmol-1
Covalent radius: 19510 pm
Van der Waals radius: 249 pm
  • Sr
  • Electron Configuration

Isotopes

There arefour naturally occurring isotopes of strontium exist, 84Sr, 86Sr, 87Sr, and 88Sr.