Atomic number: 38

Symbol: Sr

Category: alkali earth metal

Density at 25°C: solid:  2.64 g·cm−3

Another quite reactive metal, strontium was the mainly used as a component of cathode ray tubes (the old fat TV sets). Before this it was used for extracting sugar from sugar beet.

Both strontium and strontianite are named after Strontian, a village in Scotland near which the mineral was first discovered in 1790 by Adair Crawford and William Cruickshank.

Strontium in a inert gas but may have been exposed to oxygen  producing a yellow coating. image: adapted from wikipedia

Use, natural applications or common combinations: 

Basic characteristics:

  • Standard atomic weight: 87.62(1)
  • Melting point:  777 °C
  • Boiling point: 1382 °C
  • Radioactivity: 
    • almost all stable naturally but one is slightly radioactive 87Sr (7.0%) 
    • 90Sr has half life of 28.7 years may be useful as it just emits electrons (beta particle). but tends to replace calcium in the body.