Hydrogen vs Francium
| Property | H Hydrogen | Fr Francium |
|---|---|---|
| Atomic number | 1 | 87 |
| Symbol | H | Fr |
| Name | Hydrogen | Francium |
| Category | nonmetal | alkali-metal |
| Standard Atomic Weight | 1.007975 u | 223 u |
| Period | 1 | 7 |
| Group | 1 | 1 |
| Block | s | s |
| Phase at STP | gas | solid |
| Electron configuration | 1s1 | [Rn]7s1 |
| Oxidation states | [-1, 1] | [1] |
| Electronegativity (Pauling) | 2.2 | 0.7 |
| Electron affinity | 0.75419 eV | 0.491 eV |
| Density | 0.08988 kg/m³ | 1870 kg/m³ |
| Melting point | -259.34 °C | 26.85 °C |
| Boiling point | -252.87 °C | -273.15 °C |
| Discovery year | 1766 | 1939 |