Terbium. Image copyright: smart-elements.com.
Terbium (Tb) is a silver-gray metallic element of the lanthanide series. Discovered in 1843, it is found in such minerals as monazite, gadolinite, and apatite. The soft element is used in semiconductors; sodium terbium borate is used in lasers. Its single natural isotope is 159Tb .
|relative atomic mass||158.925|
|melting point||1,360°C (2,480°F)|
|boiling point||3,041°C (5,506°F)|