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The two main exceptions to reading the periodic table for the electronic configuration are Chromium and Copper. Chromium will have a lower energy from a half filled d subshell so it's e- configuration is [Ar] 3d^5 4s^1. In addition, copper will have a lower energy with a full d subshell so it's e- configuration will be [Ar] 3d^10 4s^1.
The exceptions are due to the fact that 3d^5 and 3^10 would then make the electron configurations back in order in terms of their principle quantum number. I could be wrong, but I think this would apply to all of the elements that are in that column.
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