Marnettblanis6aw Marnettblanis6aw

02-10-2016
Chemistry

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what defines the mass number of an isotope

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premedchemist premedchemist

03-12-2016

The mass number of an isotope is determined by the number of neutrons in the isotope plus the number of protons.
For instance Carbon-13 is an isotope of carbon. The "13" is the mass number of the isotope.
So, in this example, 13 = #protons + #neutrons

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