What is mean by Atornic mass numbex ?
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The mass number (symbol A, from the German word Atomgewicht [atomic weight]), also called atomic mass number or nucleon number, is the total number of protons and neutrons (together known as nucleons) in an atomic nucleus. ... The mass number is different for each different isotope of a chemical element.
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atomic mass no. means the sum of no. of protons and no. of neutrons present in an atom
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