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Phosphorus
Reactive nonmetals · Group 15 · Period 3
Atomic properties
| Atomic number | 15 |
|---|---|
| Symbol | P |
| Standard atomic weight | 30.974 |
| Classification | Reactive nonmetals |
| Group | 15 |
| Period | 3 |
| Block | p-block |
| Electron configuration | [Ne] 3s2 3p3 |
| Electronegativity (Pauling) | 2.19 |
| Common oxidation states | +5, +3, -3 |
Physical properties
| Phase at 20 °C | Solid |
|---|---|
| Density | 1.823 g/cm³ |
| Melting point | 44.15 °C |
| Boiling point | 280.5 °C |
| Discovered | 1669 |
| CAS number | — |