Draw the missing peak: silicon mass spectrum

An example figure from the Mass Spectrum generator.

The mass spectrum of silicon with peaks at m/z 28 and 30 and the peak at m/z 29 left out, with an answer key under the graph — The mass spectrum of silicon with its peak at m/z 29 left out, for students to draw in. The peaks at m/z 28 (92.22%) and 30 (3.09%) are shown, so the missing isotope’s abundance is what’s left of 100%. The answer key names the missing peak and gives silicon’s relative atomic mass.

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Answer key

Silicon (Si): relative atomic mass 28.09
Missing peak: m/z 29, 4.68%
Relative atomic mass: (27.977 × 92.223 + 28.976 × 4.685 + 29.974 × 3.092) ÷ 100 = 28.09

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