This atom of radon has an atomic mass of 222., This atom of radon has an atomic number of 86, so it has 86 protons., This arrow represents the radon undergoing Alpha decay., The polonium atom has a mass of 218, 4 less than the radon., the polonium atom has 84 protons, 2 less than the radon., The alpha particle has an atomic mass of 4., The alpha particle has 2 protons., An alpha particle can be described as a helium nucleus or the ⍺ symbol..

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