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The Atomic Mass number must be higher as that represent the number of protons and neutrons in an element. Whereas only the number of protons are represented in the Atomic Number.

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Q: If there is a difference between a substance atomic number and its atomic mass which measure must be the larger number?
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If there is a difference between a substance's atomic number and its atomic mass and which measure must be the larger number?

The atomic mass number must be higher as that represent the number of protons and neutrons in an element. Whereas only the number of protons are represented in the Atomic Number.


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What is the difference between a substance's atomic number and it's atomic mass?

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