How many electrons must bromine lose or gain to obtain a noble gas configuration? Give the identity of the noble gas that corresponds to the configuration.

• A. Bromine (Br) must lose one electron to obtain a noble gas configuration corresponding to krypton (Kr).
• B. Bromine (Br) must gain one electron to obtain a noble gas configuration corresponding to krypton (Kr).
• C. Bromine (Br) must lose one electron to obtain a noble gas configuration corresponding to argon (Ar).
• D. Bromine (Br) must gain one electron to obtain a noble gas configuration corresponding to argon (Ar).

Answer: (B)