In a nuclear reaction, which is the same before and after the change?(1 point)

Question

Responses

the mass
the mass

the types of atoms
the types of atoms

the total number of protons
the total number of protons

the number of alpha particles

Answer 1

In a nuclear reaction, the quantity that remains the same before and after the change is the total number of protons.

This is because nuclear reactions conserve the overall number of protons and neutrons (baryon number). While the types of atoms and mass may change as particles are transformed or exchanged, the total count of protons (which corresponds to the atomic number) remains constant.