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Why mass number denoted by A?

Updated: 4/28/2022
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11y ago

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Mass number is the total number of protons and neutrons.

because the nucleus consists of protons and neutrons only, the sum of protons and neutrons is the total number of ALL the nucleons.

note the term "ALL" here..

this is the reason why mass number is denoted as "A".

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Q: Why mass number denoted by A?
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