Terbium

Symbol: Tb
Atomic Number: 65
Atomic Weight: 158.92534
Element Classification: Rare Earth Element (Lanthanide Series)
Discovered By: Carl Mosander
Discovery Date: 1843 (Sweden)
Name 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 (@20C J/g mol): 0.183
Fusion Heat (kJ/mol): n/a
Evaporation Heat (kJ/mol): 389
Thermal Conductivity (@25C W/m K):
Debye Temperature (K): n/a
Pauling Negativity Number: 1.2
First Ionizing Energy (kJ/mol): 569
Oxidation States: 4, 3
Electronic Configuration: [Xe] 4f9 6s2
Lattice Structure: Hexagonal (HEX)
Lattice Constant (): 3.600
Lattice C/A Ratio: 1.581

Brinell Hardness [/MN m-2]: 677
Vickers Hardness [/MN m-2]: 863

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