What is the electron configuration for Bromine?

The electron configuration for Bromine, which has an atomic number of 35, can be found by following the order in which electrons fill the atomic orbitals according to the Aufbau principle. Bromine can be represented by the noble gas core of Argon, which accounts for the first 18 electrons. After Argon, the next electrons fill the 4s orbital before moving to the 3d orbitals. In Bromine, the 4s subshell is filled with 2 electrons, followed by filling the 3d subshell completely with 10 electrons.

After filling these orbitals, the final set of electrons will fill the 4p subshell. Since Bromine has a total of 35 electrons, and Argon accounts for 18, the remaining 17 electrons will be distributed in the 4s, 3d, and finally, the 4p orbitals. The 4p subshell will have 5 electrons (2 in 4s, 10 in 3d, and 5 in 4p). Therefore, the correct electron configuration for Bromine is [Ar] 4s² 3d¹⁰ 4p⁵.

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