Holmium |
Symbol | Ho |
---|---|
Latin name | Holmium |
Atomic number | 67 |
Period | 6 |
Element category | Inner transition elements |
Relative atomic mass | 164.93032 |
Group | III.B |
Electronegativity | 1.2 |
Oxidation numbers | 3 |
Electron configuration | 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 5s2 5p6 4f11 5d0 6s2 |
Density [g/cm3] | 8.8 |
State | Solid |
Melting point [°C] | 1474 |
Boiling point [°C] | 2695 |
Atomic radius [pm] | 175 |
Covalent radius [pm] | 192 |
Thermal conductivity [W m-1K-1] | 16.2 |
Heat capacity [J K-1g-1] | 0.165 |
Discovery | 1879 |
Vickers hardness [MPa] | 481 |
Brinell hardness [MPa] | 746 |
Young's modulus [GPa] | 65 |
Electrical conductivity [S m-1] | 1.1 · 106 |
Shear modulus [GPa] | 26 |
1.st ionization energy [eV] | 6.0216 |
2.nd ionization energy [eV] | 11.805 |
3.rd ionization energy [eV] | 22.843 |
Stable isotopes | 1 |
Unstable isotopes | 28 |