Name Terbium
Symbol Tb
Atomic Number 65
Atomic Mass 158.925 atomic mass units
Number of Protons 65
Number of Neutrons 94
Number of Electrons 65
Melting Point 1360.0 C
Boiling Point 3041.0 C
Density 8.27 grams per cubic centimeter
Normal Phase Solid
Family Rare Earth Metals
Period 6
Cost $1800 per 100 grams



Origin of Name After Ytterby, Sweden
Date and Place of Discovery In 1843 in Ytterby, Sweden
Discovered by Carl Gustaf Mosander
Common Compounds
  • Terbium fluoride (TbF2)
  • Terbium oxide (Tb4O7)
  • Terbium oxide (TbO2)
Interesting facts
  • It can act similar to calcium at times.
  • It is more common than mercury and silver.
Common Uses
  • Solid state devices
  • Electronic devices
  • Fluorescent lamps
  • Color television tubes
  • Biochemistry probe
  • Lighting technology, including incandescent lighting


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Chemical Elements

Terbium Atomic Structure Elements by Name Elements by Number Home