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Scientific experiments showed evidence that the mass of an atom was greater than the total mass of its protons. these experiments led to the discovery of the
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Scientific experiments showed evidence that the mass of an atom was greater than the total mass of its protons. these experiments led to the discovery of the

User Jaycee
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The answer to your proposed question is Neutron. This is because the atomic mass unit of a neutron is 1 and so it would contribute to the overall mass of the atom.
I hope this answer helped you!
User Nipun Talukdar
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