Oxygen has three stable isotopes, $^{16}$O, $^{17}$O and $^{18}$O. All three isotopes are present in a sample of oxygen gas, O$_2$, which was analysed using a mass spectrometer.
How many peaks associated with the O$^+_2$ ion would be expected?
1 )
3
5
3 )
6
4 )
9
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