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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 totalnumber of protons and neutrons (together known as nucleons) in an atomic nucleus.
It is denoted by letter A. Carbon has 6 protons, 6electrons and 6 neutrons. So the atomic numberis 6 as the number of protons is 6. The mass number is 12 as the sum of protons and neutrons is 12.
It is denoted by letter A. Carbon has 6 protons, 6electrons and 6 neutrons. So the atomic numberis 6 as the number of protons is 6. The mass number is 12 as the sum of protons and neutrons is 12.
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