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.
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.
Source: Wikipedia "Isotopes of phosphorus" · CC BY-SA 4.0
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