The two naturally occurring isotopes of chlorine are ³⁵Cl (34.9689 u, 75.77%) and ³⁷Cl (36.9658 u, 24.23%). The two naturally occurring isotopes of bromine are ⁷⁹Br (78.9183 u, 50.69%) and ⁸¹Br (80.9163 u, 49.31%). Chlorine and bromine combine to form bromine monochloride, BrCl. Sketch a mass spectrum for BrCl with the relative number of molecules plotted against molecular mass (similar to Figure 2-14).

 Figure 2-14

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Stream of positive ions Detector 196 198 200 202 204 ||||| || Mass spectrum of mercury vapor Relative number of atoms 25 20 5 O 10 196 197 198 199 200 201 202 203 204 Mass-to-charge ratio