This chemistry question involves key chemical concepts and calculations. The detailed solution below walks through each step, from identifying the reaction type to computing the final answer.

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Hey Janet — ready when you are.
a) The relative atomic mass (RAM) of Boron is given as 10.81. The two isotopes are and . The RAM is a weighted average of the masses of its isotopes. Since 10.81 is closer to 11 than it is to 10, the isotope with the mass number 11 must be present in a higher proportion.
The more abundant isotope is .
b) The relative atomic mass of an element is never a whole number because it is the weighted average of the masses of all its naturally occurring isotopes. Most elements exist as a mixture of two or more isotopes, each with a different mass number and a specific natural abundance. This averaging process, combined with the fact that the exact mass of protons and neutrons is not precisely 1 atomic mass unit, results in a non-integer value.
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Hey Janet — ready when you are. a) The relative atomic mass (RAM) of Boron is given as 10.81.
This chemistry question involves key chemical concepts and calculations. The detailed solution below walks through each step, from identifying the reaction type to computing the final answer.