| Attribute | Holmium × | Beryllium × |
|---|---|---|
| Standard state | Solid | Solid |
| Electron configuration | [Xe]6s²4f¹¹ | [He]2s² |
| Atomic mass (u) | 164.93033 | 9.012183 |
| Electronegativity (pauling scale) | 1.23 | 1.57 |
| Oxidation states |
|
|
| Ionization energy (eV) | 6.022 | 9.323 |
| Atomic radius (van der waals) (pm) | 216 | 153 |
| Boiling point (K) | 2973 | 2744 |
| Melting point (K) | 1747 | 1560 |
| Density (g/cm³) | 8.8 | 1.85 |
| Atomic number | 67 | 4 |
| Group name | Lanthanide | Alkaline earth metal |
| Discovered (year) | 1878 | 1798 |
| Symbol | Ho | Be |