Multiple choice In beta minus emission, the number of nucleons in the atom: remains the same increases by four decreases by one decreases by one Reveal answer Fill a bubble to check yourself A Correct answer Explanation In beta minus emission, a neutron converts to a proton, emitting an electron and antineutrino. The number of nucleons (protons + neutrons = mass number) remains unchanged because one neutron becomes one proton - total count stays the same.