A lanthanide group metal, it is soft, malleable and ductile. Terbium has an abundance of 1.1 ppm in the earth’s crust and is found in minerals in combination with other lanthanide group elements. It is slowly oxidised in air, the rate of the reaction being increased if terbium powder is used. Terbium reacts slowly with cold water. Terbium is used in the semiconductor industry as a dopant.


1843 by C.G. Mosander in Stockholm and was named after the Swedish town of Ytterby.

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Atomic number 65 Clip
Atomic / Molecular Weight 158.9254 gmol-1Clip
Density 8267 kgm-3Clip
Lattice constant 361 fmClip
Melting Point 1633 KClip
Boiling Point 2773 KClip
Specific heat capacity 184 Jkg-1K-1Clip
Thermal conductivity 10.5 Wm-1K-1Clip
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See also: Periodic Table.

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Subjects: Chemistry