Final answer:
The correct electron configuration for bromine is 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁵, representing all 35 electrons that fill up to the 4p sublevel with five electrons.
Step-by-step explanation:
The electron configuration of bromine, which has an atomic number of 35, follows the standard order of filling atomic orbitals based on the energy levels and sublevels according to the Aufbau principle. Bromine's electrons fill the orbitals in the following pattern: 1s, 2s, 2p, 3s, 3p, 4s, 3d, and 4p sublevels. After these are filled sequentially according to their energy levels, we can determine the correct configuration.
Considering the options provided, the correct electron configuration for bromine is: a. 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁵.
This configuration accounts for all 35 electrons of bromine, filling up to the 4p sublevel with five electrons, which corresponds to the fact that bromine is located in Group 17 (halogens) of the periodic table and has seven electrons in its outermost shell (3p⁶ 4s² 3d¹⁰ 4p⁵).