The atomic mass of boron is 10.811. What is the mass number of the most
abundant isotope of boron?
A.9
B.12
C.11
D.10

C.11

Explanation:

Boron-11 makes up around 80% of all natural Boron. And, typically, the quickest way to determine the most abundant isotope of an element is to just round the atomic mass to the nearest whole number.

the answer is either b or c

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