Chromium vs Francium
| Property | Cr Chromium | Fr Francium |
|---|---|---|
| Atomic number | 24 | 87 |
| Symbol | Cr | Fr |
| Name | Chromium | Francium |
| Category | transition-metal | alkali-metal |
| Standard Atomic Weight | 51.9961 u | 223 u |
| Period | 4 | 7 |
| Group | 6 | 1 |
| Block | s | s |
| Phase at STP | solid | solid |
| Electron configuration | [Ar]3d54s1 | [Rn]7s1 |
| Oxidation states | [-4, -2, -1, 0, 1, 2, 3, 4, 5, 6] | [1] |
| Electronegativity (Pauling) | 1.66 | 0.7 |
| Electron affinity | 0.675 eV | 0.491 eV |
| Density | 7150 kg/m³ | 1870 kg/m³ |
| Melting point | 1906.85 °C | 26.85 °C |
| Boiling point | 2670.85 °C | -273.15 °C |
| Discovery year | 1797 | 1939 |