GENERAL KNOWLEDGE

Detailed explanation-1: -When a nucleus in an atom undergoes a radioactive decay, the electronic energy levels of the atom. change for and radioactivity but not for −radioactivity.

Detailed explanation-2: -Alpha decay is a nuclear decay process where an unstable nucleus changes to another element by shooting out a particle composed of two protons and two neutrons. This ejected particle is known as an alpha particle and is simply a helium nucleus.

Detailed explanation-3: -Nuclear decay occurs when the nucleus of an atom is unstable and spontaneously emits energy in the form of radiation. The result is that the nucleus changes into the nucleus of one or more other elements. These daughter nuclei have a lower mass and are more stable (lower in energy) than the parent nucleus.

Detailed explanation-4: -The decay of technetium-99, which has too many neutrons to be stable, is an example of beta decay. A neutron in the nucleus converts to a proton and a beta particle. The nucleus ejects the beta particle and some gamma radiation.

Detailed explanation-5: -When a nucleus, having atomic number Z and mass number A, undergoes a radioactive decay process, 1) Both Z and A will decrease, if the process is decay. 2.) Z will decrease but A will not change, if the process is + decay.