15P

Phosphorus

Reactive Nonmetal

Phosphorus (P) is element 15, a reactive nonmetal, in period 3 and group 15 of the periodic table. Its standard atomic weight is 30.974, it melts at 44.15 °C and boils at 280.5 °C. Discovered by Hennig Brand, 1669.

Atomic Number15

SymbolP

NamePhosphorus

Atomic Weight30.974 u

CategoryReactive Nonmetal

Period3

Group15

Melting Point44.15 °C

Boiling Point280.5 °C

Density1.82 g/cm³

Electron Config[Ne] 3s2 3p3

Discovered ByHennig Brand, 1669

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