Naturally occurring boron comprises two isotopes, boron-10 and boron-11. The atomic mass of boron-10 is 10.013 amu. The atomic mass of boron-11 is 11.009 amu. Which of the following is the best estimate of the percent abundance of each isotope of boron? Why?
50.0% boron-10 and 50.0% boron-11
20.0% boron-10 and 80.0% boron-11
80.0% boron-10 and 20.0% boron-11
95.0% boron-10 and 5.0% boron-11
5.0% boron-10 and 95.0% boron-11
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