Protons and neutrons, the fundamental building blocks of an atom, reside within the atomic nucleus. Protons carry a positive charge, while neutrons remain neutral. The number of protons defines an element’s identity, while the combination of protons and neutrons determines its mass. Phosphorus, an essential element, has two primary isotopes: Phosphorus-31, with a stable nucleus consisting of 15 protons and 16 neutrons, and Phosphorus-32, a radioactive isotope with 15 protons and 17 neutrons.
