Silicon, Which Makes Up About 25% of Earth's Crust by Mass

question 48

Multiple Choice

Silicon, which makes up about 25% of Earth's crust by mass, is used widely in the modern electronics industry. It has three naturally occurring isotopes, ²⁸Si, ²⁹Si, and ³⁰Si. Calculate the atomic mass of silicon.

• A) 29.2252 amu
• B) 28.9757 amu
• C) 28.7260 amu
• D) 28.0855 amu
• E) 27.9801 amu

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