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OpenStudy (j3nny0rtiz):
How many neutrons does element X have if its atomic number is 58 and its mass number is 168? neutrons
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OpenStudy (sweetburger):
The mass of an atom is composed of the mass of the neutrons + mass of the protons. Electrons have a negligible mass. You know that the atomic number is made up by the number of Protons. You now know that you have 58 protons. So you have 168 = protons + neutrons 168= 58 + neutrons. Solve to get neutrons by itself.
OpenStudy (j3nny0rtiz):
110?
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