Zirconium

Symbol | Zr
Latin name | Zirkonium
Atomic number | 40
Period | 5
Element category | Transition elements
Relative atomic mass | 91.244
Group | IV.B
Electronegativity | 1.4
Oxidation numbers | 4
Electron configuration | 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d2 5s2
Density [g/cm3] | 6.506
State | Solid
Melting point [°C] | 1852
Boiling point [°C] | 3800
Atomic radius [pm] | 206
Covalent radius [pm] | 148
Thermal conductivity [W m-1K-1] | 22.7
Heat capacity [J K-1g-1] | 0.278
Discovery | 1789
Hardness [Mohs scale] | 5.0
Vickers hardness [MPa] | 903
Brinell hardness [MPa] | 650
Young's modulus [GPa] | 68
Electrical conductivity [S m-1] | 2.3 · 106
Shear modulus [GPa] | 33
1.st ionization energy [eV] | 6.6339
2.nd ionization energy [eV] | 13.13
3.rd ionization energy [eV] | 22.99
Stable isotopes | 5
Unstable isotopes | 16