Bromine vs Promethium
| Property | Br Bromine | Pm Promethium |
|---|---|---|
| Atomic number | 35 | 61 |
| Symbol | Br | Pm |
| Name | Bromine | Promethium |
| Category | halogen | lanthanide |
| Standard Atomic Weight | 79.904 u | 145 u |
| Period | 4 | 6 |
| Group | 17 | N/A |
| Block | p | s |
| Phase at STP | liquid | solid |
| Electron configuration | [Ar]4s23d104p5 | [Xe]6s24f5 |
| Oxidation states | [-1, 1, 2, 3, 4, 5, 7] | [2, 3] |
| Electronegativity (Pauling) | 2.96 | N/A |
| Electron affinity | 3.3635 eV | 0.129 eV |
| Density | 3102.8 kg/m³ | 7260 kg/m³ |
| Melting point | -7.2 °C | 1041.85 °C |
| Boiling point | 58.8 °C | 2999.85 °C |
| Discovery year | 1825 | 1902 |