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Atomic number is the number of protons in the nucleus of an atom while the mass number is the sum of the protons and neutrons in the nucleus of an atom. for example lithium has an atomic number of 3 and a mass number of 7. Therefore lithium has 3 protons and 4 neutrons.

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Q: Explain the difference between atomic number and mass number?
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What best describes the number of neutrons in an atom?

It is equal to the difference between atomic number and Atomic Mass number. A+


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