Atomic number: 58

Symbol: Ce

Category: lanthanoid metal

Density at 25°C: solid: density: 6.770 g·cm−3

Being quite similar to lanthanum this metal element is actually quite common on the Earth's crust, it is commonly found in minerals and ores like monazite and bastnasite. It is mostly used as part of catalytic converters as Cerium (III) oxide. Also it is regarded as being an excellent polisher of glass as  Cerium(IV) oxide . 

Cerium sample. image adapted from wikipedia

Use, natural applications or common combinations: 

  • stabilises polymers from changing colour due to sunlight
  • essential to phosphors of old TV sets
  • used in welding
  • permanent magnets

Basic characteristics:

  • Standard atomic weight: 140.116(1)
  • Melting point:  795 °C [799°C]
  • Boiling point: 3443 °C
  • Radioactivity: mostly all stable