Naturally Occurring Silicon Is Composed of Three Isotopes: ²⁸Si (Atomic

Multiple Choice

Naturally occurring silicon is composed of three isotopes: ²⁸Si (atomic mass 27.98) , ²⁹Si (atomic mass 28.98) , and ³⁰Si (atomic mass 29.97) . The atomic mass of the naturally occurring isotope mixture is 28.0855. The relative percentages of ²⁸Si, ²⁹Si, and ³⁰Si are

A) 99.7, 0.1, 0.2
B) 92.2, 4.7, 3.1
C) 90.2, 1.3, 8.5
D) 80.2, 10.8, 9.0
E) 50.4, 20.5, 29.1