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OpenStudy (anonymous):
A certian isotope has an atomic number of 71 and a mass number of 207. How many neutrons does this isotope have? @callisto @ganeshie8
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OpenStudy (welshfella):
atomic number = number of protons mass number = number of protons + number of neutrons
OpenStudy (welshfella):
so can you work it out?
OpenStudy (anonymous):
136
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