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Terbium Facts

Chemical & Physical Properties

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This is a photo of terbium, one of the rare earth elements. Terbium is a soft silvery-white metal.

This is a photo of terbium, one of the rare earth elements. Terbium is a soft silvery-white metal.

Tomihahndorf, Free Documentation License
Periodic Table of the Elements

Terbium

Atomic Number: 65

Symbol: Tb

Atomic Weight: 158.92534

Discovery: Carl Mosander 1843 (Sweden)

Electron Configuration: [Xe] 4f9 6s2

Element Classification: Rare Earth (Lanthanide)

Word Origin: Named after Ytterby, a village in Sweden.

Density (g/cc): 8.229

Melting Point (K): 1629

Boiling Point (K): 3296

Appearance: soft, ductile, silvery-gray, rare-earth metal

Atomic Radius (pm): 180

Atomic Volume (cc/mol): 19.2

Covalent Radius (pm): 159

Ionic Radius: 84 (+4e) 92.3 (+3e)

Specific Heat (@20°C J/g mol): 0.183

Evaporation Heat (kJ/mol): 389

Pauling Negativity Number: 1.2

First Ionizing Energy (kJ/mol): 569

Oxidation States: 4, 3

Lattice Structure: Hexagonal

Lattice Constant (Å): 3.600

Lattice C/A Ratio: 1.581

References: Los Alamos National Laboratory (2001), Crescent Chemical Company (2001), Lange's Handbook of Chemistry (1952), CRC Handbook of Chemistry & Physics (18th Ed.)

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