The instability of the nucleus can be due to various causes. An unstable nucleus emits radiations if possible of transform into less unstable state. Then the cause and the result can be

Options

A. A nucleus of excess nucleons is `alpha` -active
B. An excited nucleus of excess protons is `beta^(-)` acitve
C. An excited nucleus of excess protons is `beta^(+)` active
D. A nucleus of excess neutrons is `beta^(-)` active

Answer

A, C, D