Answer :
When radon-222 (Rn-222) undergoes radioactive decay to become polonium-218 (Po-218), it emits an alpha particle.
An alpha particle consists of two protons and two neutrons, which are essentially the nucleus of a helium atom. During the decay process, the Rn-222 nucleus releases an alpha particle, reducing its atomic number by 2 and its mass number by 4. This emission of an alpha particle is a characteristic of alpha decay, which is a type of radioactive decay commonly observed in certain isotopes.
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