PERIODIC TABLE

Hafnium

Atomic No. 72 Hf Hafnium

About Hafnium

Hafnium is a transition metal with atomic number 72 whose compounds predominantly contain hafnium in the +4 oxidation state. Hafnium oxide is an electrical insulator used in microelectronic devices. Hafnium metal is also used in nuclear control rods because it absorbs neutrons strongly, giving it a role different from that of chemically similar zirconium.

Properties

Atomic Number
72
Atomic Symbol
Hf
Atomic Mass
178.49
CAS No.
7440-58-6
Density
13.31 g/cm³
Series
transition metal
Melting Point
2,233°C
Boiling Point
4,603°C
Thermal Conductivity
0.23 W/cm °C
Heat of Fusion
25.5 kJ/mol
Heat of Vaporization
630 kJ/mol
Electronegativity
1.3 pauling
Crystal Structure
Hexagonal
Electrical Conductivity
3.3×106 S/m

Hafnium Products

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