The highest mass peaks in the mass spectrum of Br2 occur at m/z 158, 160, and 162. The ratio of intensities of these peaks is approximately 1:2:1. Bromine has two stable isotopes, 79Br (50.7% abundance) and 81Br (49.3% abundance). What molecular species gives rise to each of these peaks? (Include the mass numbers of the isotopes in your answers.)
m/z 158:
m/z 160:
m/z 162: