Zirconium (Zr) — Element 40: Properties & Data | Aladdin Scientific
Zirconium(Zr) — Element 40
Zirconium (Zr) is a transition metal with atomic number 40 and atomic mass 91.22. It has melting point 2128 K (1855 °C), boiling point 4682 K (4409 °C), density 6.52 g/cm³. It sits in group 4 and period 5 of the periodic table and was discovered in 1789.
Key facts
| Atomic mass | 91.2200 u |
|---|---|
| Electron configuration | [Kr]5s2 4d2 |
| Oxidation states | +4 |
| Electronegativity (Pauling) | 1.33 |
| Atomic radius (van der Waals) | 186 pm |
| Ionization energy | 6.634 eV |
| Electron affinity | 0.426 eV |
| Melting point | 2128 K |
| Boiling point | 4682 K |
| Density | 6.52 g/cm³ |
| Standard state | Solid |
| Year discovered | 1789 |
Frequently asked questions
What is the electron configuration of zirconium?
The ground-state electron configuration of zirconium is [Kr]5s2 4d2.
What group and period is zirconium in?
Zirconium (Zr) is in group 4 and period 5 of the periodic table, classified as a transition metal.
What is the melting point of zirconium?
Zirconium melts at 2128 K (1855 °C).
What is the standard state of zirconium?
Zirconium 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: .