Radioactivity and Atomic Energy
Science

A particle made of two protons and two neutrons, it is emitted from a radioactive nucleus
Alpha particle
A particle made of two protons and two neutrons, it is emitted from a radioactive nucleus. Alpha particle. An alpha particle is a type of radiation often described as a tiny, fast-moving helium nucleus emitted by certain radioactive materials.

A fission reaction which creates products that continue the same reaction repeatedly
Chain reaction
A fission reaction which creates products that continue the same reaction repeatedly. Chain reaction. In science, a chain reaction is a process where the products of a reaction cause more reactions to occur in a continuous cycle.

The splitting of an atomic nucleus into smaller nuclei and neutrons, this releases energy
Nuclear fission
The splitting of an atomic nucleus into smaller nuclei and neutrons, this releases energy. Nuclear fission. In simple terms, nuclear fission is when an atom's core breaks apart, releasing a lot of energy.