What is a rule for determining the mass number of an atom?

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What is a rule for determining the mass number of an atom?

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Answer 1 · 2015-11-08T01:18:54

Mass number is the sum of the protons and neutrons in the atomic nucleus.

Explanation:

The mass number (#"A"#) is the sum of the atomic number (#"Z"#), which is the number of protons, and the number of neutrons (#"N"#) in the atomic nucleus of an isotope of an element. #"A=Z+N"#

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What is a rule for determining the mass number of an atom?

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