This element has only two naturally occurring isotopes, in which the lighter isotope has an abundance of 19.9% and mass of 10.012937 and the heavier isotope has a mass of 11.009305.  Calculate the weighted atomic mass of this element.

Chemistry: Matter and Change
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Chapter4: The Structure Of The Atom
Section: Chapter Questions
Problem 102A
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This element has only two naturally occurring isotopes, in which the lighter isotope has an abundance of 19.9% and mass of 10.012937 and the heavier isotope has a mass of 11.009305.  Calculate the weighted atomic mass of this element.

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