72
Hf
178.49
Hafnium (Hf)
Element 72 · Period 6 · Group 4
transition-metal
solid at room temp
d-block
About Hafnium
Excellent neutron absorber. Used in nuclear control rods and computer chips.
Physical Properties
Atomic Mass
178.49 u
State at 25°C
Solid
Melting Point
2233 °C
Boiling Point
4603 °C
Density
13.31 g/cm³
Magnetism
Paramagnetic
Atomic Properties
Electron Configuration
[Xe] 4f¹⁴ 5d² 6s²
Electron Shells
2, 8, 18, 32, 10, 2
Electronegativity
1.3
Atomic Radius
208 pm
Ionization Energy
659 kJ/mol
Oxidation States
+4
Discovery & History
Discovered By
Dirk Coster
Discovery Year
1923
Named By
Dirk Coster
Name origin: Latin: Hafnia (Copenhagen)
Frequently Asked Questions
- Is Hafnium a metal, nonmetal, or metalloid?
- Hafnium is classified as a transition-metal.
- What state is Hafnium in at room temperature?
- Hafnium is a solid at standard room temperature (25°C).
- What is the atomic mass of Hafnium?
- Hafnium has an atomic mass of 178.49 atomic mass units (u).
- Who discovered Hafnium?
- Hafnium was discovered by Dirk Coster in 1923.
- Where is Hafnium on the periodic table?
- Hafnium is element number 72, located in period 6 and group 4.