# How many Peaks would you see in a Mass Spectrum of O^(2+) Given that there are 3 commonly occuring isotopes of O?

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- hcbiochemLv 72 weeks ago
The three stable isotopes of O are 16-O, 17-O and 18-O.

If you are asking about an oxide anion (O^2+), there would be 3 peaks, each corresponding to one of the 3 isotopes of O.If, instead, you are asking about O2^+ (diatomic oxygen minus one electron), there would be 6 peaks corresponding to the following diatomic molecules:

16-16

16-17

16-18

17-17

17-18

18-18

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