| Attribute | Curium × | Terbium × |
|---|---|---|
| Electronegativity (pauling scale) | 1.3 | - |
| Atomic mass (u) | 247.07035 | 158.92535 |
| Standard state | Solid | Solid |
| Oxidation states |
|
|
| Electron configuration | [Rn]7s²5f⁷6d¹ | [Xe]6s²4f⁹ |
| Ionization energy (eV) | 6.02 | 5.864 |
| Atomic radius (van der waals) (pm) | 245 | 221 |
| Boiling point (K) | 3400 | 3503 |
| Melting point (K) | 1618 | 1629 |
| Density (g/cm³) | 13.51 | 8.23 |
| Atomic number | 96 | 65 |
| Group name | Actinide | Lanthanide |
| Discovered (year) | 1944 | 1843 |
| Symbol | Cm | Tb |