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I believe it is two isotopes of an element. Because an isotope is the amount of protons. with a different number of neutrons in the nucleus. hopefully this will help :)

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13y ago
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14y ago

one is magnesium while the other is an ion of magnesium

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Q: The nucleus of an atom contains 12 protons and 12 neutrons while the necleus of another atom contains 12 protons and 16 neutrons what are the atoms?
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