40
Zr
Zirconium
Transition metal period 5 group 4 d-block discovered: 1789
As a chemical element
Properties of the atom — they do not depend on what substance it is part of.
- Atomic number
- 40
- Atomic mass
- 91.22 a.m.u.
- Electron configuration
- [Kr]5s2 4d2
- Electronegativity
- 1.33 on the Pauling scale
- Atomic radius
- 186 pm
- Ionization energy
- 6.634 eV
- Electron affinity
- 0.426 eV
- Oxidation states
- +4
As a simple substance
Properties of the substance these atoms form under ordinary conditions.
- State at 25 °C
- Solid
- Melting point
- 2128 K (1 854,85 °C)
- Boiling point
- 4682 K (4 408,85 °C)
- Density
- 6.52 g/cm³