15 P
Reactive nonmetal
Phosphorus
Essential for DNA and ATP.
Properties of Phosphorus
- Atomic number (Z)
- 15
- Symbol
- P
- Atomic mass
- 30.974 g/mol
- Category
- Reactive nonmetal
- Group
- 15
- Period
- 3
- Electron configuration
- [Ne] 3s² 3p³
- Electronegativity (Pauling)
- 2.19
- Atomic radius
- 98 pm
- First ionization energy
- 1012 kJ/mol
- Melting point
- 317.3 K (44.2 °C)
- Boiling point
- 553.65 K (280.5 °C)
- Density
- 1.823 g/cm³
- Phase at 25 °C
- Solid
- Discovered
- Discovered in 1669