Boron Has Two Isotopes: B-10 and B-11, with Masses of 10.013

question 82

Multiple Choice

Boron has two isotopes: B-10 and B-11, with masses of 10.013 amu and 11.009 amu, respectively. The relative atomic mass of boron is 10.81 amu. Which statement best describes the percent abundance of the isotopes of boron?

• A)It contains more B-10 than B-11.
• B)It contains more B-11 than B-10.
• C)It contains equal amounts of B-10 and B-11.
• D)There must be a third isotope of boron.
• E)A mass spectrum of boron is necessary to answer this question.

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