Electron Configuration of Br-

[Kendall Schemmer 1I]

The electron configuration of Br- is [Ar] 3d10 4s2 4p6. However, would it also be correct to write it as just [Kr]?

[Curtis Wong 2D]

Yes it would be correct to just write as [Kr] if they ask for the shorthand of it.

[Jessica_Singh_1J]

Definitely make sure to ask your instructors which notation they prefer beforehand.

[Cameron Smith 1I]

When dealing with anions and cations how do we distinguish their electron configurations from other elements?

[Ziana Bhanji 1E]

I think it would be correct, but make sure to ask your TA maybe.

[Jesus A Cuevas - 1E]

Presenting the electron configuration of Br- as [Kr] would be correct, but keep in mind that they may be expecting you to give the full electron configuration rather than just the shorthand.

[Chem_Mod]

[Ar] 3d10 4s2 4p6 is the preferred notation because chemistry (valence electron interactions) of Br- ion actually is better represented this way than a stable Kr atom which is represented by [Kr].