15 P

Reactive nonmetal

Phosphorus

Essential for DNA and ATP.

See it in the interactive periodic table

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
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