Chlorine vs Francium
| Property | Cl Chlorine | Fr Francium |
|---|---|---|
| Atomic number | 17 | 87 |
| Symbol | Cl | Fr |
| Name | Chlorine | Francium |
| Category | halogen | alkali-metal |
| Standard Atomic Weight | 35.4515 u | 223 u |
| Period | 3 | 7 |
| Group | 17 | 1 |
| Block | p | s |
| Phase at STP | gas | solid |
| Electron configuration | [Ne]3s23p5 | [Rn]7s1 |
| Oxidation states | [-1, 1, 2, 3, 4, 5, 6, 7] | [1] |
| Electronegativity (Pauling) | 3.16 | 0.7 |
| Electron affinity | 3.6127 eV | 0.491 eV |
| Density | 3.214 kg/m³ | 1870 kg/m³ |
| Melting point | -101.5 °C | 26.85 °C |
| Boiling point | -34.04 °C | -273.15 °C |
| Discovery year | 1774 | 1939 |