Q. Consider the following types of radioactive decay:

1. The type of decay that causes the number of neutrons in the nucleus to decrease by 1
2. The type of decay that keeps the identity of the nucleus unchanged
3. The type of decay that ejects the heaviest particle

Which among the following is the correct set of types of decays corresponding to the above respectively?
Answer: Beta-minus decay, Gamma decay, Alpha decay
Notes: In beta-minus decay, a neutron is converted into a proton, thus reducing the number of neutrons by 1. Gamma decay releases excess nuclear energy without changing the nucleus's identity. Alpha decay ejects an alpha particle (helium nucleus), making it the heaviest particle emitted among the decay types.