Hafnium
Symbol
Hf
Atomic Number
72
Atomic Weight
178.49
Element Classification
Discovered By
Dirk Coster, Georg von Hevesy
Discovery Date
1923 (Denmark)
Name Origin
Hafnia, the Latin name of Copenhagen.
Density (g/cc)
13.31
Melting Point (K)
2503
Boiling Point (K)
5470
Appearance
Silvery, ductile metal
Atomic Radius (pm)
167
Atomic Volume (cc/mol)
13.6
Covalent Radius (pm)
144
Ionic Radius
78 (+4e)
Specific Heat
0.146
Fusion Heat (kJ/mol)
(25.1)
Evaporation Heat (kJ/mol)
575
Thermal Conductivity (@25°C W/m K)
23.0
Debye Temperature (K)
n/a
Pauling Negativity Number
1.3
First Ionizing Energy (kJ/mol)
575.2
Oxidation States
4
Electronic Configuration
[Xe] 4f14 5d2 6s2
Lattice Structure
Hexagonal(HEX)
Lattice Constant
3.200
Lattice C/A Ratio
1.582
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