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terbium (Tb)


terbium
Terbium.
Image copyright: smart-elements.com
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 .


atomic number 65
relative atomic mass 158.925
relative density 8.234
melting point 1,360°C (2,480°F)
boiling point 3,041°C (5,506°F)


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