define the term mass numbrr?
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The total number of protons and neutrons in a nucleus is known as mass number...
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The total number of protons and neutrons in a nucleus is known as mass number...
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The mass number of an element is the sum of the protons and neutrons within one of its atoms. For example, the mass number of carbon is usually 12, as its atom has 6 neutrons and 6 protons.
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