Question

Why only alpha particles are emitted by radioactive nuclei while protons and neutrons are not?

Answer 1

protons never radiate energy and electrons revolve in discrete orbits discrete orbits are the only orbits allowed inside the atom when the discrete Orbit an electron revolves it never radiates energy this is explained in Bohr's model of an atom

Answer 2

First of all we shall see what is an alpha particle, an alpha particle is a helium nucleus that is it contains two protons and two neutron. Alpha particle are emitted by unstable or radioactive atomic nuclei.
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