72 Hf
Transition metal
Hafnium
Used in nuclear control rods.
Properties of Hafnium
- Atomic number (Z)
- 72
- Symbol
- Hf
- Atomic mass
- 178.49 g/mol
- Category
- Transition metal
- Group
- 4
- Period
- 6
- Electron configuration
- [Xe] 4f¹⁴ 5d² 6s²
- Electronegativity (Pauling)
- 1.3
- Atomic radius
- 208 pm
- First ionization energy
- 659 kJ/mol
- Melting point
- 2506 K (2232.8 °C)
- Boiling point
- 4876 K (4602.9 °C)
- Density
- 13.31 g/cm³
- Phase at 25 °C
- Solid
- Discovered
- Discovered in 1923