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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.)