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Holmium (Ho)
Atomic number 67 · Lanthanide
| Atomic number | 67 |
|---|---|
| Atomic mass | 164.93033 u |
| Molar mass | 164.93033 g/mol |
| Category | Lanthanide |
| Group / period / block | — / 6 / f |
| Electron configuration | [Xe] 4f11 6s2 |
| Electrons per shell | 2, 8, 18, 29, 8, 2 |
| Electronegativity (Pauling) | 1.23 |
| Atomic radius | 175.0 pm |
| Density | 8.8 g/cm³ |
| First ionisation energy | 6.0215 eV |
| Melting point | 1745.15 K (1472.00 °C) |
| Boiling point | 2973.15 K (2700.00 °C) |
| Common oxidation states | +3 |
| Abundance in Earth's crust | 1.3 ppm |
Uses
Strongest magnetic fields, medical lasers
Discovery
1878, J.L. Soret