Model 3: Intensities of [M+2]+Peaks Mass spectra with [M+2]+peaks usually contain sulfur, chlorine or bromine. The intensity of the [M+2]2 peak is determined by the abundance of the next most common isotope. Questions 10. Compared to the [M]+peak, what will the intensity of the [M+2]+peak be for a molecule containing sulfur: much higher, higher, about the same, lower, or much lower? 11. Fill in the blanks in the following two statements. a. If the intensities of the [M+2]+and [M+peaks are approximately equal, then there is likely one atom in the molecule. b. If the intensity of the [M+2]+is about one-third that of the [M]+peak, then there is likely one atom in the molecule. 12. Does the following mass spectrum contain an S,Cl,Br or none of the above