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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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