Atomic number: 39

Symbol: Y

Category: transition metal

Density at 25°C: solid:  4.472 g·cm−3

Yttrium is a fairly reactive element and is not found int nature by itself, usually it is locked up with minerals, particularly rare earth minerals. It's mostly used for making phosphors, the red ones, in CRT and LEDs. 

Yttirum crystals(dendrites). image: adapted from wikipedia

Use, natural applications or common combinations: 

  • Alloy material enhancement
  • Catalysts for ethylene polymerisation
  • Synthetic garnets
  • Some superconductors

Basic characteristics:

  • Standard atomic weight: 88.905 85(2)
  • Melting point:  1526 °C
  • Boiling point: 3336 °C
  • Radioactivity: all naturally stable
    • 90Yttirum is used in some cancer treatments via monoclonal antibodies.