Rubidium vs Samarium
| Property | Rb Rubidium | Sm Samarium |
|---|---|---|
| Atomic number | 37 | 62 |
| Symbol | Rb | Sm |
| Name | Rubidium | Samarium |
| Category | alkali-metal | lanthanide |
| Standard Atomic Weight | 85.4678 u | 150.36 u |
| Period | 5 | 6 |
| Group | 1 | N/A |
| Block | s | s |
| Phase at STP | solid | solid |
| Electron configuration | [Kr]5s1 | [Xe]6s24f6 |
| Oxidation states | [-1, 1] | [0, 1, 2, 3] |
| Electronegativity (Pauling) | 0.82 | 1.17 |
| Electron affinity | 0.4859 eV | 0.156 eV |
| Density | 1530 kg/m³ | 7520 kg/m³ |
| Melting point | 39.31 °C | 1073.85 °C |
| Boiling point | 687.85 °C | 1793.85 °C |
| Discovery year | 1861 | 1878 |