Hafnium

Hf Hafnium
72
178.49
6
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
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
(25.1)
Evaporation Heat(kj/mol)
575
Thermal Conductivity(@25°C W/m K)
23.0
Debye Temperature
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

KEY

SEE ALSO

Hafnium

Columbia Encyclopedia

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