Tellurium vs Promethium
| Property | Te Tellurium | Pm Promethium |
|---|---|---|
| Atomic number | 52 | 61 |
| Symbol | Te | Pm |
| Name | Tellurium | Promethium |
| Category | metalloid | lanthanide |
| Standard Atomic Weight | 127.6 u | 145 u |
| Period | 5 | 6 |
| Group | 16 | N/A |
| Block | p | s |
| Phase at STP | solid | solid |
| Electron configuration | [Kr]5s24d105p4 | [Xe]6s24f5 |
| Oxidation states | [-2, -1, 0, 1, 2, 3, 4, 5, 6] | [2, 3] |
| Electronegativity (Pauling) | 2.1 | N/A |
| Electron affinity | 1.9708 eV | 0.129 eV |
| Density | 6232 kg/m³ | 7260 kg/m³ |
| Melting point | 449.51 °C | 1041.85 °C |
| Boiling point | 987.85 °C | 2999.85 °C |
| Discovery year | 1782 | 1902 |