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OpenStudy (anonymous):
atom has 12 electrons and a mass number of 24. How many neutrons does it have?
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OpenStudy (anonymous):
mass number = #protons + #neutrons
OpenStudy (anonymous):
assuming the atom isn't an ion, the #electrons should equal the #protons
OpenStudy (anonymous):
so #protons = 12. 24-12=12 so there are 12 neutrons
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