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If an atom of the twelfth element (magnesium) has an atomic mass of 25, how many protons (p), neutrons (n), and electrons (e) does it have?
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If an atom of the twelfth element (magnesium) has an atomic mass of 25, how many protons (p), neutrons (n), and electrons (e) does it have?

User Alexander Somov
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12 protons, 12 electrons and 13 neutrons

User DRiFTy
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5 votes
It has 12 protons and 12 electrons.
And it has 13 neutrons.
User Marc Wagner
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