The principal natural isotope of phosphorus is P-31; isotopes P-32 and P-33 are only in traces and unstables.

They are isotopes of Phosphorus and show similarity in their physical properties to that of Phosphorus.

Phosphorus is considered practically monoisotopic: P-31; radioactive isotopes P-32 and P-33 exist only in traces.

Phosphorus is in the group 15 and period 3 of the periodic table of Mendeleev.

All isotopes of a substance are chemically the same. It is their physical properties which are different.