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If you know the number of protons what else do you know the number of?
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If you know the number of protons what else do you know the number of?

User Vvvvv
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If you know the number of protons you also know the number of electrons because an element has the same number of electrons as it does protons.
User Mehbub
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5 votes
you know the atomic number
User Ignacio Chiazzo
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