Out of the following, which are NOT emitted by a radioactive substance?

Following are the processes of radioactive decay:

(i) Alpha decay: helium nuclei with a charge equal to that of two protons is emitted.

(ii) Beta decay: electrons are emitted from nucleus.

(iii) Gamma decay: gamma radiation (electromagnetic radiation) is emitted in this process.

Hence, neutrons are not emitted during radioactive decay.