A neutral isotope of phosphorus, phosphorus-32 (1532P^{32}_{15}\text{P}1532P), is widely used in biochemical research and medical diagnostics. This isotope has an atomic number of 15 and a mass number of 32.
Explain, with reference to the quantities and relative charges of its constituent subatomic particles, why a single neutral atom of phosphorus-32 has no overall electrical charge.