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Chemistry 18 Online
OpenStudy (anonymous):

The element copper (Cu) is an exception to Aufbau principle. Which of the following is its correct configuration? 1s22s22p63s23p63d94s2 or 1s22s22p63s23p63d104s1

OpenStudy (surry99):

The second is correct. The lower energy case is when you have 10 electrons in the 3d (ie: the 3d orbitals are full) and 1 in the 4s

OpenStudy (surry99):

This is an exception to the rule that must be memorized for exams. Chromium does the same type of thing with its outermost electrons...[Ar]3d54s1

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