What is mass number and atomic
number?
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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.
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mass no. is the total number of protons and neutrons in a nucleus
and...
atomic no. is the number of protons in the nucleus of an atom, which is characteristic of a chemical element and determines its place in the periodic table.
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