October 7, 2015

Homework Help: Chemistry: Electron Configurations

Posted by Anonymous on Wednesday, November 4, 2009 at 10:27pm.

Write the electron configuration for the following ion.


I got 1s^2 2s^2 2p^6 3s^2 3p^6 4s^2. In simplified form, I got [Ar]4s^2.
I checked my answer against the answer given in the back of my chemistry textbook, and the two didn't correspond. The answer my book gives is [Ar] 3d^2.
I don't understand what I did wrong...

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