Problem: There are two different isotopes of bromine atoms. Under normal conditions, elemental bromine consists of Br2 molecules, and the mass of a Br2 molecule is the sum of the masses of the two atoms in the molecule. The mass spectrum of Br2 consists of three peaks: Mass (amu)  Relative Size157.8360.2569159.8340.4999161.8320.2431What is the origin of second (mass of 159.834 amu) peak (of what isotopes does each consist)?

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two isotopes: 79Br, 81Br


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There are two different isotopes of bromine atoms. Under normal conditions, elemental bromine consists of Br2 molecules, and the mass of a Br2 molecule is the sum of the masses of the two atoms in the molecule. The mass spectrum of Br2 consists of three peaks:


 Mass (amu Relative Size
157.8360.2569
159.8340.4999
161.8320.2431


What is the origin of second (mass of 159.834 amu) peak (of what isotopes does each consist)?

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