Question

A sample of silicon has three naturally occurring isotopes: Si-28 (mass 28.0 amu); Si-29 (mass 29.0 amu) and Si-30 (mass = 30.0 amu). If the average atomic mass of silicon is 28.1 amu, which isotope is the most abundant?
A) Si-28
B) Si-29
C) Si-30
D) All isotopes have the same natural abundance.

Answer

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