The name of the product isotope formed when Radon-222 decays by alpha decay is polonium-218.
What is alpha particle?
Alpha particles, also known as alpha rays or alpha radiation, are made up of two protons and two neutrons bonded together to form a helium-4 nucleus like particle.
As Radon-222 is an unstable radioactive substance and will do radioactive decay by the emission of alpha particle and as a result of which it produces a isotope polonium-218 isotope. As these two have same atomic number but different atomic masses.
Hence formed product isotope is polonium-218.
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