Atomic number: 65

Symbol: Tb

Category: lanthanoid metal

Density at 25°C: solid: density: 8.23 g·cm−3

As with some of other lanthenoids, this tends to be used as a phosphors (often for glowing green) but also is used in small amounts in metal alloys and other compounds especially solid state electronics. 

Terbium metal sample (3grams). image: images-of-elements.com

Use, natural applications or common combinations: 

  • Electronics
  • Phosphors

Basic characteristics:

  • Standard atomic weight: 158.925 35(2)
  • Melting point:  1356 °C
  • Boiling point: 3273 °C
  • Radioactivity: most naturally stable