Periodic table of the elements
LutetiumHafniumTantalum
72
Hf
Hafnium
178.49
2
8
18
32
10
2
72
Hf
Hafnium
178.49
2
8
18
32
10
2
General
NameHafnium
SymbolHf
Number72
Chemical seriesTransition elements
Group / Period4 / 6
Blockd-block
CAS registry number7440-58-6

Physical properties
Statesolid
Density13.31 g/cm3
Melting point2506 K (2233 °C, 4051 °F)
Boiling point4876 K (4603 °C, 8317 °F)
Critical point

Atomic properties
Atomic Weight178.49 g/mol
Crystal structurehexagonal
Electronegativity1.30
Atomic radius155 pm
Atomic radius (calculated)208 pm
Electron configuration[Xe] 4f14 5d2 6s2
Electrons per shell2, 8, 18, 32, 10, 2
Number of protons72
Number of neutrons106

Other languages
SpanishHafnio
PortugueseHáfnio
FrenchHafnium
GermanHafnium
ItalianAfnio
RussianГафний
PolishHafn
Chinese
Arabicهافنيوم
TurkishHafniyum
DutchHafnium


Periodic table of the elements
LutetiumHafniumTantalum