What is the electron configuration for Br?

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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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What is the electron configuration and noble gas core for Br?

argon is because it's the last noble gas used to get to Br.. it's like a short cut, instead of writing 1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 3d^10 4p^5 you can skip a lot of it by t

Electron configuration of br?

1s 2 2s 2 2p 6 3s 2 3p 6 4s 2 3d 10 4p 5 Or 1s 2 2s 2 2p 6 3s 2 3p 6 4s 2 3d 10 4p 5 Or [Ar] 4s 2 3d 10 4p 5