Terbium
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Terbium is a chemical element, having the chemical symbol Tb.
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Its atomic number (the number of protons) is 65. It has a Standard Atomic Weight of 158.92534(2), and is typically found as a solid in its elemental form.
Terbium is considered to be a member of the "Lanthanide" class of elements, has a boiling point of 3,230 °C , and a melting point of 1,356 °C .