Oxygen vs Erbium
| Property | O Oxygen | Er Erbium |
|---|---|---|
| Atomic number | 8 | 68 |
| Symbol | O | Er |
| Name | Oxygen | Erbium |
| Category | nonmetal | lanthanide |
| Standard Atomic Weight | 15.9994 u | 167.259 u |
| Period | 2 | 6 |
| Group | 16 | N/A |
| Block | p | s |
| Phase at STP | gas | solid |
| Electron configuration | [He]2s22p4 | [Xe]6s24f12 |
| Oxidation states | [-2, -1, 0, 1, 2] | [0, 1, 2, 3] |
| Electronegativity (Pauling) | 3.44 | 1.24 |
| Electron affinity | 1.4611 eV | 0.312 eV |
| Density | 1.429 kg/m³ | 9070 kg/m³ |
| Melting point | -218.79 °C | 1528.85 °C |
| Boiling point | -182.95 °C | 2867.85 °C |
| Discovery year | 1771 | 1843 |