Multiple choice

In beta minus emission, the number of nucleons in the atom:

  1. remains the same

  2. increases by four

  3. decreases by one

  4. decreases by one

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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.