Answer:
[Ar] 3d10 4s2 4p5
Explanation:
Remember that noble gases are elements that have all of their orbitals full, this means that they are complete and are almost not reactant because chemically they do not need to react with others to complete their orbitals, the electronic configuration of the element Bromo, the atomic orbitals would be [Ar] 3d10 4s2 4p5 since is the noble gas prior to the atomic number plus the uncompleted orbitals, and the last one one be 4p5, Ar