Chlorine vs Meitnerium
| Property | Cl Chlorine | Mt Meitnerium |
|---|---|---|
| Atomic number | 17 | 109 |
| Symbol | Cl | Mt |
| Name | Chlorine | Meitnerium |
| Category | halogen | transition-metal |
| Standard Atomic Weight | 35.4515 u | 278 u |
| Period | 3 | 7 |
| Group | 17 | 9 |
| Block | p | s |
| Phase at STP | gas | N/A |
| Electron configuration | [Ne]3s23p5 | [Rn]7s25f146d7(calculated) |
| Oxidation states | [-1, 1, 2, 3, 4, 5, 6, 7] | [1, 3, 4, 6, 8, 9] |
| Electronegativity (Pauling) | 3.16 | N/A |
| Electron affinity | 3.6127 eV | 1.7 eV |
| Density | 3.214 kg/m³ | 3.740000e+4 kg/m³ |
| Melting point | -101.5 °C | -273.15 °C |
| Boiling point | -34.04 °C | -273.15 °C |
| Discovery year | 1774 | 1982 |