Mass Number

The mass number, a fundamental concept in nuclear physics, defines the total number of protons and neutrons within an atomic nucleus. Represented by the symbol A, it plays a crucial role in determining an element's stability and properties. As the sum of these subatomic particles, the mass number distinguishes isotopes of a given element, reflecting variations in atomic mass. Understanding the mass number is essential for comprehending nuclear reactions, decay processes, and the overall behavior of atoms, contributing significantly to our grasp of the intricate nature of atomic structures.