Hafnium (Hf) — Element 72: Properties & Data | Aladdin Scientific
Hafnium(Hf) — Element 72
Hafnium (Hf) is a transition metal with atomic number 72 and atomic mass 178.49. It has melting point 2506 K (2233 °C), boiling point 4876 K (4603 °C), density 13.3 g/cm³. It sits in group 4 and period 6 of the periodic table and was discovered in 1923.
Key facts
| Atomic mass | 178.4900 u |
|---|---|
| Electron configuration | [Xe]6s2 4f14 5d2 |
| Oxidation states | +4 |
| Electronegativity (Pauling) | 1.3 |
| Atomic radius (van der Waals) | 212 pm |
| Ionization energy | 6.825 eV |
| Melting point | 2506 K |
| Boiling point | 4876 K |
| Density | 13.3 g/cm³ |
| Standard state | Solid |
| Year discovered | 1923 |
Frequently asked questions
What is the electron configuration of hafnium?
The ground-state electron configuration of hafnium is [Xe]6s2 4f14 5d2.
What group and period is hafnium in?
Hafnium (Hf) is in group 4 and period 6 of the periodic table, classified as a transition metal.
What is the melting point of hafnium?
Hafnium melts at 2506 K (2233 °C).
What is the standard state of hafnium?
Hafnium is a solid at standard temperature and pressure.
Related elements
About this data: property values compiled from IUPAC Standard Atomic Weights (2021), the NIST Atomic Spectra Database, and PubChem. Curated by the Aladdin Scientific technical team. Last reviewed: .