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12 April, 16:17

Why is it called relative atomic mass?

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  1. 12 April, 16:28
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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.
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