Barium vs Erbium
| Property | Ba Barium | Er Erbium |
|---|---|---|
| Atomic number | 56 | 68 |
| Symbol | Ba | Er |
| Name | Barium | Erbium |
| Category | alkaline-earth-metal | lanthanide |
| Standard Atomic Weight | 137.327 u | 167.259 u |
| Period | 6 | 6 |
| Group | 2 | N/A |
| Block | s | s |
| Phase at STP | solid | solid |
| Electron configuration | [Xe]6s2 | [Xe]6s24f12 |
| Oxidation states | [1, 2] | [0, 1, 2, 3] |
| Electronegativity (Pauling) | 0.89 | 1.24 |
| Electron affinity | 0.1447 eV | 0.312 eV |
| Density | 3620 kg/m³ | 9070 kg/m³ |
| Melting point | 726.85 °C | 1528.85 °C |
| Boiling point | 1896.85 °C | 2867.85 °C |
| Discovery year | 1808 | 1843 |