Which of the following best describes what happens in radioactive decay? The nucleus emits particles and/or energy. The electron cloud emits particles and/or energy. The nucleus transfers particles and/or energy to the electron cloud. The electron cloud transfers energy to the nucleus.

The nucleus emits particles and/or energy

Explanation:

In nuclear decay, the nucleus of an unstable atom (usually with a high neutron number over protons) splits into lighter more stable atoms. The process involves the release of energy particles such as neutrons or beta particles and energy. The released particles bombard with the other unstable atoms in the vicinity and split them producing a chain reaction.