72
Hf
hafnium
178.49

General properties

Group
group 4
Period
period 6
Category
transition metals
Standard atomic weight
178.486(6)
Melting point
2506 K (2233 °C)
Boiling point
4876 K (4603 °C)
Phase at STP
solid

Additional properties

Block
d-block
Electron configuration
[Xe] 4f¹⁴ 5d² 6s²
Electrons per shell
2, 8, 18, 32, 10, 2
Electronegativity
1.3
Density
13.31 g/cm³
Oxidation states
−2, +1, +2, +3, +4 (an amphoteric oxide)
CAS Number
7440-58-6