Answer:

Explanation:
The atomic number refers to the total count of electrons or protons found in a neutral atom.
Nonetheless, when discussing the atomic number of an ion, it does not correspond to the electron count since electrons can be added or removed.
Therefore, it is more accurate to refer to the number of protons located in the atom's nucleus as the atomic number.
Consequently, the atomic number of phosphorus is 15
The mass number reflects the total count of particles in the nucleus, equating to the addition of protons and neutrons.
Given that the mass number is 32
Thus, the symbol for the isotope is:-
