Hydrogen vs Radium
| Property | H Hydrogen | Ra Radium |
|---|---|---|
| Atomic number | 1 | 88 |
| Symbol | H | Ra |
| Name | Hydrogen | Radium |
| Category | nonmetal | alkaline-earth-metal |
| Standard Atomic Weight | 1.007975 u | 226 u |
| Period | 1 | 7 |
| Group | 1 | 2 |
| Block | s | s |
| Phase at STP | gas | solid |
| Electron configuration | 1s1 | [Rn]7s2 |
| Oxidation states | [-1, 1] | [2] |
| Electronegativity (Pauling) | 2.2 | 0.9 |
| Electron affinity | 0.75419 eV | 0.096 eV |
| Density | 0.08988 kg/m³ | 5000 kg/m³ |
| Melting point | -259.34 °C | 699.85 °C |
| Boiling point | -252.87 °C | 1139.85 °C |
| Discovery year | 1766 | 1898 |