define the mass of magnesium relative to relative atomic mass
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Here u represents the unified atomic mass unit and is equal to the mass of one nucleon (proton or neutron). Likewise, magnesium-25 will have an atomic mass of 25 u because it contains 12 protons aqnd 13 neutrons. This means that the relative atomic mass of magnesium will be.
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Relative atomic mass or atomic weight is a dimensionless physical quantity defined as the ratio of the average mass of atoms of a chemical element in a given sample to the atomic mass constant. The atomic mass constant is defined as being of the mass of a carbon-12 atom
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