67Ho164.93
Holmium (Ho)
Element 67 · Lanthanide
Holmium (Ho) is a chemical element with atomic number 67. It is classified as a lanthanide in period 6 of the periodic table (the f-block). Its standard atomic weight is 164.93 u and its ground-state electron configuration is [Xe] 4f¹¹ 6s².
Holmium facts
| Atomic number (Z) | 67 |
|---|---|
| Symbol | Ho |
| Standard atomic weight | 164.93 u |
| Category | Lanthanide |
| Group | — (f-block) |
| Period | 6 |
| Block | f-block |
| Electron configuration | [Xe] 4f¹¹ 6s² |
| Electronegativity (Pauling) | 1.23 |
| State at 20 °C | Solid |
| Protons / electrons | 67 / 67 |
| Neutrons (most common isotope, approx.) | 98 |
| Molar mass | 164.93 g/mol |