Mass spectrum of magnesium

An example figure from the Mass Spectrum generator.

The mass spectrum of magnesium: three peaks at m/z 24, 25 and 26 labeled 78.99%, 10.00% and 11.01% — The mass spectrum of magnesium: one peak for each of its three natural isotopes, at m/z 24, 25 and 26, each as tall as its percent abundance and labeled with it. Magnesium-24 makes up nearly four fifths of natural magnesium, which is why its relative atomic mass is close to 24.

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Answer key

Magnesium (Mg): relative atomic mass 24.31
Relative atomic mass: (23.985 × 78.99 + 24.986 × 10 + 25.983 × 11.01) ÷ 100 = 24.31

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