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What two particles account for almost all of the mass of an atom?
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What two particles account for almost all of the mass of an atom?

User Whitfin
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Protons and neutrons have an atomic mass unit (amu) weight of 1 while electrons are so light they are considered weightless.

User Imperalix
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The two particles that account for the mass of an atom are protons and neutrons. Electrons on the other hand are negligible mass, and so light they are considered without weight.
User Hignesh Hirani
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