A molecule containing which of the following atoms will produce a (M+2)+• peak that is approximately equal to the intensity of the molecular ion peak?Select answer from the options belowOxygenNitrogenChlorineBromineSulfur
Question
A molecule containing which of the following atoms will produce a (M+2)+• peak that is approximately equal to the intensity of the molecular ion peak?Select answer from the options belowOxygenNitrogenChlorineBromineSulfur
Solution
The answer is Chlorine.
Here's why:
Isotopes are versions of an element that have different numbers of neutrons. The mass spectrometer can distinguish between different isotopes based on their different masses.
Most elements exist primarily as a single isotope, so their mass spectrum shows a large peak (the base peak) for the molecular ion, which corresponds to the most common isotope, and smaller peaks for any other isotopes.
However, chlorine is unusual because it has two isotopes, 35Cl and 37Cl, that are present in roughly equal amounts (about 75% and 25% respectively). This means that a molecule containing chlorine will produce a (M+2)+• peak that is approximately equal to the intensity of the molecular ion peak.
The other elements listed (oxygen, nitrogen, bromine, and sulfur) do not have this property.
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