Erbium |
Symbol | Er |
---|---|
Latin name | Erbium |
Atomic number | 68 |
Period | 6 |
Element category | Inner transition elements |
Relative atomic mass | 167.26 |
Group | III.B |
Electronegativity | 1.2 |
Oxidation numbers | 3 |
Electron configuration | 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 5s2 5p6 4f12 5d0 6s2 |
Density [g/cm3] | 9.066 |
State | Solid |
Melting point [°C] | 1545 |
Boiling point [°C] | 2863 |
Atomic radius [pm] | 226 |
Thermal conductivity [W m-1K-1] | 14.3 |
Heat capacity [J K-1g-1] | 0.168 |
Discovery | 1843 |
Vickers hardness [MPa] | 589 |
Brinell hardness [MPa] | 814 |
Young's modulus [GPa] | 70 |
Electrical conductivity [S m-1] | 1.2 · 106 |
Shear modulus [GPa] | 28 |
1.st ionization energy [eV] | 6.1078 |
2.nd ionization energy [eV] | 11.929 |
3.rd ionization energy [eV] | 22.739 |
Stable isotopes | 6 |
Unstable isotopes | 10 |