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What 2 particles account for almost all if the mass of an atom
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What 2 particles account for almost all if the mass of an atom

User Rakesh Gupta
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Protons and neutrons both weigh 1 Amu electrons are so small they weigh 0 amid so it's protons and neitrons
User JNWHH
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Protons and Neutrons make up the atomic mass in an atom. Electrons DO NOT whatsoever. 
User Sami Andoni
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