QUESTION Bromine has two isotopes, 79Br and 81B.. To find out the isotopic abundance of each bromine isotope, a sample of Br, was injected to a mass spectrometer which subsequently released the spectra shown below. From each spectrum height was measured and tabulated. Explain why there are five peaks despite that bromine has only two isotopes. Hint: Read carefully the description of mass spectrometer in the previous Question #5, “How to find isotopic abundance?", especially the phrase in red! DATA Mass Number Peak height, cm 79 4.12 81 4.12 158 3.34 160 6.68 162 3.34 79 81 158 160 162 MASS, amu Relative Abundance

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Mass Spectrometry

This process is an instrumental method in which a sample is changed to fast moving positive ions by electron bombardment. The charged particles vary due to their different mass to charge ratio and are estimated with the help of this difference. It is also called mass spectroscopy.