Phosphorus (P)
Element 15 Ā· Reactive nonmetal
Phosphorus (P) is a chemical element with atomic number 15. It is classified as a reactive nonmetal in period 3, group 15 of the periodic table (the p-block). Its standard atomic weight is 30.974 u and its ground-state electron configuration is [Ne] 3sĀ² 3pĀ³.
Phosphorus facts
| Atomic number (Z) | 15 |
|---|---|
| Symbol | P |
| Standard atomic weight | 30.974 u |
| Category | Reactive nonmetal |
| Group | 15 |
| Period | 3 |
| Block | p-block |
| Electron configuration | [Ne] 3sĀ² 3pĀ³ |
| Electronegativity (Pauling) | 2.19 |
| State at 20 Ā°C | Solid |
| Protons / electrons | 15 / 15 |
| Neutrons (most common isotope, approx.) | 16 |
| Molar mass | 30.974 g/mol |