P

Phosphorus

Atomic Number 15 · Red phosphorus powder

Essential for life — found in DNA, RNA, and ATP. White phosphorus glows in the dark and is highly flammable.

Atomic Mass

30.974 u

Category

Reactive Nonmetal

Phase (STP)

Solid

Density

1.82 g/cm³

Melting Point

44.15 °C

Boiling Point

280.5 °C

Electronegativity

2.19 (Pauling)

Atomic Radius

100 pm

Electron Configuration

[Ne] 3s2 3p3

Discovered

1669 — Hennig Brand

Find Phosphorus Samples

Sample form: Red phosphorus powder

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