Terbium
Symbol
Tb
Atomic Number
65
Atomic Weight
158.92534
Element Classification
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
0.183
Fusion Heat (kJ/mol)
n/a
Evaporation Heat (kJ/mol)
389
Thermal Conductivity (@25°C W/m K)
11.1
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
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