Tellurium vs Actinium
| Property | Te Tellurium | Ac Actinium |
|---|---|---|
| Atomic number | 52 | 89 |
| Symbol | Te | Ac |
| Name | Tellurium | Actinium |
| Category | metalloid | actinide |
| Standard Atomic Weight | 127.6 u | 227 u |
| Period | 5 | 7 |
| Group | 16 | N/A |
| Block | p | s |
| Phase at STP | solid | solid |
| Electron configuration | [Kr]5s24d105p4 | [Rn]7s26d1 |
| Oxidation states | [-2, -1, 0, 1, 2, 3, 4, 5, 6] | [3] |
| Electronegativity (Pauling) | 2.1 | 1.1 |
| Electron affinity | 1.9708 eV | 0.35 eV |
| Density | 6232 kg/m³ | 1.007000e+4 kg/m³ |
| Melting point | 449.51 °C | 1050.85 °C |
| Boiling point | 987.85 °C | 3197.85 °C |
| Discovery year | 1782 | 1899 |