Strontium - ASCII Periodic Table of the Elements

ASCII PERIODIC TABLE OF THE ELEMENTS

  Sr

Relative atomic mass: 87.62 ± 0.01

English: Strontium
French: Strontium
Croatian: Stroncij
German: Strontium
Italian: Stronzio
Spanish: Estroncio

Atomic number: 38
Group numbers: 2
Period: 5
Standard state (20 °C): solid

Discovery: 1789 Adair Crawford (GB)

Strontium was discovered by Adair Crawford (GB) in 1789. Named after the village of 'Strontian' in Scotland. It is a soft, malleable, silvery-yellow metal that is combustible in air and reacts with water. Exposed surfaces form protective oxide film. It ignites and burns readily. Strontium is found in minerals celestite and strontianite. Strontium is used in flares and fireworks for crimson colour. Strontium-90 is a long lived highly radioactive fallout product of atomic-bomb explosions.

Electronic configuration: [Kr] 5s²
Formal oxidation number: +2
Atomic radius: 215.1 pm

Electronegativities: 0.95
Thermal conductivity: 49 W/(m K)
Electrical resistivity (20 °C): 23 μΩcm

Melting point: 777 °C
Boiling point: 1382 °C

Heat of fusion: 9.16 kJ/mol
Heat of vaporization: 154.4 kJ/mol
Heat of atomization: 164.4 kJ/mol