40ZrZirconium91.2242[Kr] 4d² 5s²
transition metal
Zirconium
Zirconium is a chemical element with symbol Zr and atomic number 40. The name of zirconium is taken from the name of the mineral zircon, the most important source of zirconium. The word zircon comes from the Persian word zargun زرگون, meaning "gold-colored".
A stylized shell model. Electrons are quantum objects, not particles following these literal paths. Sizes and motion are illustrative.
Electrons by shell
Electron configuration
4d2
5s2
36 is the [Kr] core total across four shells.
At a glance
- Atomic number
- 40
- Atomic mass
- 91.2242 u
- Phase
- Solid
- Density
- 6.52 g/cm³
- Melting point
- 2,128 K
- Boiling point
- 4,650 K
- First ionization energy
- 640.1 kJ/mol
- Electronegativity
- 1.33
- Electron affinity
- 41.806 kJ/mol
- Molar heat capacity
- 25.36 J/(mol·K)
- Period
- 5
- Appearance
- silvery white
Conditions and isotopes affect measured properties. Some properties of short-lived elements are predicted. Electronegativity uses the Pauling scale.
Keep exploring
Explore the stories, imagery, and reference data in more depth. Properties with no value in the reference are marked unavailable.