do all elements have unique mass number and atomic number? what is the reason?
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yes , mass number = proton + neutron but, atomic number = no of proton
mass number is the sum of proton and neutron present in atomic nucleus but atomic number is equal to the number of proton in atomic nucleus
mass number is the sum of proton and neutron present in atomic nucleus but atomic number is equal to the number of proton in atomic nucleus
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