# Problem: Which of the following exists as two naturally occuring isotopes separated in mass by two amu and therefore shows an (M+2)+ peak roughly 1/3 as intense as M + in the mass spectrum.  a) Bromine b) Chlorine c) Nitrogen d) All of the above e) None of the above

###### Problem Details

Which of the following exists as two naturally occuring isotopes separated in mass by two amu and therefore shows an (M+2)+ peak roughly 1/3 as intense as M + in the mass spectrum.

a) Bromine

b) Chlorine

c) Nitrogen

d) All of the above

e) None of the above