chelsey1002 chelsey1002

16-12-2016
Mathematics

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How many neutrons does element X have if its atomic number is 57 and its mass number is 168?

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Apocrophon Apocrophon

16-12-2016

Mass number is # of protons + # of neutrons
since the atomic number is the number of protons, the number of protons is 57
so 168 = 57 + x
x = 111 neutrons

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Аноним Аноним

16-12-2016

Mass number is number of protons + number of neutrons

168 - 57 = Answer

Answer = 111

Answer Link

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