90

Th

Thorium
232.03806 (2)
 Historical Information

Thorium was discovered by Berzelius in 1828 in a mineral given to him by the Reverend Has Morten Thrane Esmark.
Basic Information Shells
  • Name:Thorium
  • Symbol: Th
  • Atomic number: 90
  • Atomic weight: 232.03806 (2)
  • Standard state: solid at 298 K
  • Group in periodic table:
  • Group name:Actinoid
  • Period in periodic table: 7
  • Block in periodic table: f-block
  • Classification: Metallic
 Thorium
Uses Trivia
  • source of nuclear energy
  • oxide is used to control the grain size of tungsten used for electric lamps

Thorium is slowly attacked by water, but does not dissolve readily in most common acids, except hydrochloric. Powdered thorium metal is often pyrophoric and should be carefully handled.