The quantity that remains the same before and after a nuclear change is the total charge.
The quantity that remains the same before and after a nuclear change is the total mass. During a nuclear change, such as radioactive decay or nuclear fission, the nucleus of an atom undergoes a transformation, releasing or absorbing energy. However, the total mass of the system remains constant before and after the nuclear change occurs. This concept is known as the law of conservation of mass, which states that mass cannot be created or destroyed, only rearranged or transformed. So, regardless of the nuclear change that takes place, the total mass of the system will remain unchanged.
