AP Chemistry
1.2 Mass Spectra of Elements
A water-treatment laboratory analyzes a sample containing an unknown alkaline earth metal, \(\text{M}\), using mass spectrometry. The instrument is adjusted so that all detected ions are \(\text{M}^{2+}\). Thus, each reported \(m/z\) value is the isotope's mass number divided by the magnitude of the ion's charge. The peak positions and relative abundances are shown below.
Which choice correctly identifies \(\text{M}\) and justifies the identification from the data?
| \(m/z\) | Relative abundance (%) |
|---|---|
| 42.0 | 0.6 |
| 43.0 | 9.9 |
| 43.5 | 7.0 |
| 44.0 | 82.5 |
Which choice correctly identifies \(\text{M}\) and justifies the identification from the data?
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