Lithium vs Actinium
| Property | Li Lithium | Ac Actinium |
|---|---|---|
| Atomic number | 3 | 89 |
| Symbol | Li | Ac |
| Name | Lithium | Actinium |
| Category | alkali-metal | actinide |
| Standard Atomic Weight | 6.9675 u | 227 u |
| Period | 2 | 7 |
| Group | 1 | N/A |
| Block | s | s |
| Phase at STP | solid | solid |
| Electron configuration | [He]2s1 | [Rn]7s26d1 |
| Oxidation states | [1] | [3] |
| Electronegativity (Pauling) | 0.98 | 1.1 |
| Electron affinity | 0.61804 eV | 0.35 eV |
| Density | 534 kg/m³ | 1.007000e+4 kg/m³ |
| Melting point | 180.5 °C | 1050.85 °C |
| Boiling point | 1341.85 °C | 3197.85 °C |
| Discovery year | 1817 | 1899 |