Hafnium

Transition metals · Group 4 · Period 6

Atomic properties

Atomic number	72
Symbol	Hf
Standard atomic weight	178.49
Classification	Transition metals
Group	4
Period	6
Block	d-block
Electron configuration	[Xe] 4f14 5d2 6s2
Electronegativity (Pauling)	1.30
Common oxidation states	+4

Physical properties

Phase at 20 °C	Solid
Density	13.31 g/cm³
Melting point	2233 °C
Boiling point	4603 °C
Discovered	1923
CAS number	—

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