ANSWER: Helium Nucleus
Explanation:
- Alpha decay or α-decay is a type of radioactive decay in which an atomic nucleus emits an alpha particle (helium nucleus) and thereby transforms or 'decays' into an atom with a mass number that is reduced by four and an atomic number that is reduced by two.
- An alpha particle is identical to the nucleus of a helium-4 atom, which consists of two protons and two neutrons.
- Gamma rays consist of Photons.
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