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Electron configuration for ions

Posted: Thu Oct 20, 2016 10:29 pm
by Angela_Kim_1N
If we are writing the electron configuration of an ion such as Cl-, then is it [Ar] or [Ne] 3s2 3p6?

Re: Electron configuration for ions  [ENDORSED]

Posted: Thu Oct 20, 2016 11:00 pm
by Karan Ishii 3E
Both are technically correct but just go with [Ar] to save you and anybody else some time.

Re: Electron configuration for ions

Posted: Thu Oct 20, 2016 11:33 pm
by Vincent Tse 2B
I think the important thing to remember is that the electron configurations for ions require your attention on the addition or subtraction of electrons.

For example, if you were to write the configuration for the anion Cl^-, it would be [Ar] and not its neutral config. [Ne] 3s^2 3p^5 since the ion actually has one more electron than the neutral atom.