Europium |
Symbol | Eu |
---|---|
Latin name | Europium |
Atomic number | 63 |
Period | 6 |
Element category | Inner transition elements |
Relative atomic mass | 151.965 |
Group | III.B |
Electronegativity | 1.0 |
Oxidation numbers | 2, 3 |
Electron configuration | 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 5s2 5p6 4f7 5d0 6s2 |
Density [g/cm3] | 5.243 |
State | Solid |
Melting point [°C] | 822 |
Boiling point [°C] | 1597 |
Atomic radius [pm] | 231 |
Thermal conductivity [W m-1K-1] | 13.9 |
Heat capacity [J K-1g-1] | 0.182 |
Discovery | 1896 |
Vickers hardness [MPa] | 167 |
Young's modulus [GPa] | 18 |
Electrical conductivity [S m-1] | 1.1 · 106 |
Shear modulus [GPa] | 7.9 |
1.st ionization energy [eV] | 5.6704 |
2.nd ionization energy [eV] | 11.245 |
3.rd ionization energy [eV] | 24.926 |
Stable isotopes | 2 |
Unstable isotopes | 19 |