Question

In Mass Spectrometry:

How many peaks would you expect to see and what would be their relative intensities for

a) a bromine atom

b) a chlorine atom

c) an iodine atom

Answer 1

a)

in presence of bromine atom 2 isotopic peaks are expect to see those are M and M+2 peaks and their intensities are 1 :1 (because bromine has two isotope ⁷⁹Br and ⁸¹Br)

b)

in presence of Chlorine atom 2 isotopic peaks are expect to see those are M and M+2 peaks and their intensities are 3 :1 (because bromine has two isotope ³⁵Cl and ³⁷Cl)

c)

in presence of iodine atom only one isotopic peak is expect to see i.e Molecular ion peak (because iodine has tone isotope ¹²⁷I)