Sodium vs Erbium
| Property | Na Sodium | Er Erbium |
|---|---|---|
| Atomic number | 11 | 68 |
| Symbol | Na | Er |
| Name | Sodium | Erbium |
| Category | alkali-metal | lanthanide |
| Standard Atomic Weight | 22.989769 u | 167.259 u |
| Period | 3 | 6 |
| Group | 1 | N/A |
| Block | s | s |
| Phase at STP | solid | solid |
| Electron configuration | [Ne]3s1 | [Xe]6s24f12 |
| Oxidation states | [-1, 0, 1] | [0, 1, 2, 3] |
| Electronegativity (Pauling) | 0.93 | 1.24 |
| Electron affinity | 0.5479 eV | 0.312 eV |
| Density | 970 kg/m³ | 9070 kg/m³ |
| Melting point | 97.8 °C | 1528.85 °C |
| Boiling point | 882.85 °C | 2867.85 °C |
| Discovery year | 1807 | 1843 |