65. Terbium
Name: Terbium
Symbol: Tb
Atomic Number: 65
Atomic Mass: 158.92534 amu
Melting Point: 1360.0 °C (1633.15 °K, 2480.0 °F)
Boiling Point: 3041.0 °C (3314.15 °K, 5505.8 °F)
Number of Protons/Electrons: 65
Number of Neutrons: 94
Classification: Rare Earth
Crystal Structure: Hexagonal
Density(293 K): 8.27 g/cm3
Color: silverish
Terbium is reasonably stable in air. It is a silvery-grey metal, and is malleable, ductile, and soft enough to be cut with a knife. It is a rare earth metal found in cerite, gadolinite and monazite. The element itself was isolated only recently.
Terbium was discovered by Swedish chemist Carl Gustaf Mosander in 1843 and named after the village Ytterby in Sweden, who detected it as an impurity in Yttrium-oxide, Y2O3. It was not isolated in pure form until the recent advent of ion-exchange techniques.
As with the other lanthanides, terbium compounds are of low to moderate toxicity, although their toxicity has not been investigated in detail. Terbium has no known biological role.
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