Atomic number:38

Group numbers:2

Period:5

Electronic configuration:[Kr] 5s²

Formal oxidation number:+2

Electronegativities:0.95

Atomic radius / pm:215.1

Relative atomic mass:87.62 ± 0.01

 

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.

Density / g dm^-3:2540 (293 K)

 2375 (m.p.)

Molar volume / cm³mol^-1:34.50 (293 K)

 36.89 (m.p.)

Electrical resistivity / μΩcm:23 (20 °C)

Thermal conductivity / W m^-1K^-1:49

Melting point / °C:777

Boiling point / °C:1382

Heat of fusion / kJ mol^-1:9.16

Heat of vaporization / kJ mol^-1:154.4

Heat of atomization / kJ mol^-1:164.4

1st ionization energy / kJ mol^-1:549.48

2nd ionization energy / kJ mol^-1:1064.25

3rd ionization energy / kJ mol^-1:4138.29

in the atmosphere / ppm:-

in the Earth's crust / ppm:260

in the oceans / ppm:8