Final answer:
The correct option(5): electron configuration for the bromide ion (Br-) is (Ar) 4s² 3dⁱ⁰ 4p⁶, which is option 5 from the list provided.
Step-by-step explanation:
The correct electron configuration for the bromide ion (Br-) is (Ar) 4s² 3d¹⁰ 4p⁶. This represents the filled valence shell of the bromine atom, which has gained an extra electron to achieve a noble gas configuration similar to krypton. When an atom gains electrons to form an ion, it fills the orbital(s) according to the Aufbau principle, which dictates the order in which orbitals are filled based on their increasing energy levels.
Out of the given options, the correct electron configuration for the bromide ion is option 5: (Ar) 4s² 3dⁱ⁰ 4p⁶.