Chlorine vs Mendelevium
| Property | Cl Chlorine | Md Mendelevium |
|---|---|---|
| Atomic number | 17 | 101 |
| Symbol | Cl | Md |
| Name | Chlorine | Mendelevium |
| Category | halogen | actinide |
| Standard Atomic Weight | 35.4515 u | 258 u |
| Period | 3 | 7 |
| Group | 17 | N/A |
| Block | p | s |
| Phase at STP | gas | solid |
| Electron configuration | [Ne]3s23p5 | [Rn]7s25f13 |
| Oxidation states | [-1, 1, 2, 3, 4, 5, 6, 7] | [2, 3] |
| Electronegativity (Pauling) | 3.16 | 1.3 |
| Electron affinity | 3.6127 eV | 0.997 eV |
| Density | 3.214 kg/m³ | 1.030000e+4 kg/m³ |
| Melting point | -101.5 °C | 826.85 °C |
| Boiling point | -34.04 °C | -273.15 °C |
| Discovery year | 1774 | 1955 |