give some info about two reference atoms
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Mass of an atom is concentrated in its nucleus. It is th sum of proton(p) and neutron(n). The number(p+n) is called atomic mass number. ... Initially hydrogen atom being lightest was chosen as the reference atom.
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Atomic mass is the sum of electron and neutron in the atoms. Atomic number gives the number of electrons So, to determine the atomic number the reference of atom is needed.
If we do not take the reference atom for atomic mass, then the mass values will be more complex to memorize.
The carbon atom is one of the reference atom. The relative mass a carbon atom was accepted as 12
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