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If an atom has an atomic number of 15 and an atomic mass of 31, how many protons, neutrons and electrons does the atom contain?
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If an atom has an atomic number of 15 and an atomic mass of 31, how many protons, neutrons and electrons does the atom contain?

User Scott Weinstein
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15 protons (atomic number is always the number of protons) 15 electrons because no charge was mentioned so it must be the same as protons 16 neutrons because mass number is the combined number of protons and neutrons
User Dexterians
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