Atomic number: 63

Symbol: Eu

Category: lanthanoid metal

Density at 25°C: solid: density: 5.264 g·cm−3  [5.248] 

Most europium is used as compounds that produce phosphorescence (glow in the dark material). Interestingly a compound of it is used in Euro bank notes for anti counterfeiting purposes. Europium is also one of the most reactive lanthanoid metals. 

Europium sample slightly oxidised. image: adapted from wikipedia

Use, natural applications or common combinations: 

  • phosphors
  • optics,
  •  Europium in chemical complexes have been developed to produce very bright red light. Ref: EurekAlert

Basic characteristics:

  • Standard atomic weight: 151.964(1)
  • Melting point:  826 °C [822]
  • Boiling point: 1529 °C
  • Radioactivity: most naturally stable