What is the electron configuration for br-?

The electronic configuration of Br atom is [Ar] 4s2 3d10 4p5. Since, bromide ion has gained 1- charge by acquiring one more electron, its electronic configuration is [Ar] 4s2 3d10 4p6.
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In many cases, early in the book you follow the rules you only make clear later in the book. I admit I was frustrated early on by your use of "which" and "that". Was the ordering of the book intentional?

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What is the electron configuration of elements Br?

Bromine's atomic number is 35. Therefore, it has 35 protons and 35 electrons. Filling in the first 35 electron orbitals gives us 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p5.
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