Thallium vs Meitnerium
| Property | Tl Thallium | Mt Meitnerium |
|---|---|---|
| Atomic number | 81 | 109 |
| Symbol | Tl | Mt |
| Name | Thallium | Meitnerium |
| Category | post-transition-metal | transition-metal |
| Standard Atomic Weight | 204.3835 u | 278 u |
| Period | 6 | 7 |
| Group | 13 | 9 |
| Block | p | s |
| Phase at STP | solid | N/A |
| Electron configuration | [Xe]6s24f145d106p1 | [Rn]7s25f146d7(calculated) |
| Oxidation states | [-5, -2, -1, 1, 2, 3] | [1, 3, 4, 6, 8, 9] |
| Electronegativity (Pauling) | 1.62 | N/A |
| Electron affinity | 0.377 eV | 1.7 eV |
| Density | 1.180000e+4 kg/m³ | 3.740000e+4 kg/m³ |
| Melting point | 303.85 °C | -273.15 °C |
| Boiling point | 1472.85 °C | -273.15 °C |
| Discovery year | 1861 | 1982 |