Phosphorus vs Radium
| Property | P Phosphorus | Ra Radium |
|---|---|---|
| Atomic number | 15 | 88 |
| Symbol | P | Ra |
| Name | Phosphorus | Radium |
| Category | nonmetal | alkaline-earth-metal |
| Standard Atomic Weight | 30.973762 u | 226 u |
| Period | 3 | 7 |
| Group | 15 | 2 |
| Block | p | s |
| Phase at STP | solid | solid |
| Electron configuration | [Ne]3s23p3 | [Rn]7s2 |
| Oxidation states | [-3, -2, -1, 0, 1, 2, 3, 4, 5] | [2] |
| Electronegativity (Pauling) | 2.19 | 0.9 |
| Electron affinity | 0.7466 eV | 0.096 eV |
| Density | 1820 kg/m³ | 5000 kg/m³ |
| Melting point | 44.15 °C | 699.85 °C |
| Boiling point | 280.5 °C | 1139.85 °C |
| Discovery year | 1669 | 1898 |