Isotopes of phosphorus

Isotopes of phosphorus (15P)
Main isotopes Decay
Isotope abun­dance half-life (t1/2) mode pro­duct
31P 100% stable
32P trace 14.269 d β− 32S
33P trace 25.35 d β− 33S
Standard atomic weight Ar°(P)
  • 30.973761998±0.000000005
  • 30.974±0.001 (abridged)

Although phosphorus (15P) has 22 known isotopes from 26P to 47P; only 31P is stable, thus phosphorus is considered a monoisotopic element. The longest-lived radioactive isotopes are 33P with a half-life of 25.35 days and 32P with a half-life of 14.269 days. All others have half-lives of under 2.5 minutes, most under a second.

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