There are three major isotopes of silicon: silicon-28, silicon-29, and silicon-30. Given the average atomic mass of silicon is 28.10 amu, estimate the percent abundance of the most abundant isotope of silicon.
A)8%
B)20%
C)66%
D)80%
E)92%

Question

Quizplus · Accepted Answer

Silicon-28 is the most abundant isotope, and since the average atomic mass is very close to 28 amu, it suggests that silicon-28 has a very high percent abundance, likely around 92%.

There Are Three Major Isotopes of Silicon: Silicon-28, Silicon-29, and Silicon-30