which is the heaviest particle of an atom ?
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Neutrons are heavier than protons (slightly).
Electrons have almost no mass.
Alpha particles are their own "atom", composed of 2 protons and 2 neutrons, so they don't count as parts of atoms.
Electrons have almost no mass.
Alpha particles are their own "atom", composed of 2 protons and 2 neutrons, so they don't count as parts of atoms.
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