JEE CHEMISTRY MCQ: 14 TH GROUP ELEMENTS (P-BLOCK)

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What is the average atomic mass of silicon, if it occurs naturally in 3 isotopes

\mathrm{Si}^{28}, \mathrm{Si}^{29}, \mathrm{Si}^{30}

with the abundance of

92.2 \%, 4.7 \%

and

3.1 \%

respectively?

View answer and explanation

Correct option: B

28.1 \mathrm{~amu}

Option B (28.1 amu) is correct because it is the weighted average of the isotopic masses based on their natural abundances.

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