Answer
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Step 1: Recall the periodic trend of ionization for halogens.
Halogens, which include bromine (Br), have 7 electrons in their outermost energy level. In order to achieve a stable electron configuration, they typically gain one electron to complete their octet.
Step 2: Determine the charge on a bromine ion.
When a bromine atom gains one electron, it becomes a bromide ion (Br-). The charge on a monatomic ion is equal to the number of electrons gained or lost. Since bromine gains one electron, its charge is - 1.
Final Answer
Bromine obtains a charge of - 1 when it becomes an ion (bromide ion, Br-).
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