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OpenStudy (anonymous):
Bromine, an element present in compounds used as sanitizers and fumigants (for example, ethylene bromide), has two naturally occurring isotopes, with mass numbers 79 and 81.
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OpenStudy (unklerhaukus):
\[_{35}^{79}Br , _{35}^{81}Br\] These isotopes are found in roughly equal portions and both are stable
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