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Why is it called relative atomic mass?

User Pigueiras
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Because the actual mass of a proton is 1.67x10^-27 and the same for a neutron so the mass is relative to the size of protons/neutrons. That's why electrons are not taken in to account when calculating the mass as their mass is 9.11x10^-31 so would make very little difference to the total mass.
User LukeDuff
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