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How do you determine the mass number of an atom?

User Kums
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2 Answers

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Step-by-step explanation:

The number of protons and neutrons. you can simply subtract the number of protons, or atomic number, from the mass number to get your final answer.

User Stecog
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the number of protons and the number of neutrons determine an element's mass number: mass number
User Jake Petroules
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