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Question

The excepted ground state configuration for Cu is:
1s22s22p63s23p64s23d9
The actual configuration is:
1s22s22p63s23p64s13d10
Why is the true electron configuration different?

A
The actual configuration increases stability by filling one energy level before moving on to the next. Disturbing the electrons this way gives a paramagnetic formation.
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B
The actual configuration decreases stability by filling a 3d sublevel before a 4s sublevel. Distributing the electrons in this way gives a diamagnetic formation.
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C
The actual configuration increases stability by creating a full d sublevel. Distributing the electrons in this way gives a diamagnetic formation.
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D
The actual configuration decreases stability by creating a half filled s sublevel. Distributing the electrons in this way is called a paramagnetic formation.
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Solution

The correct option is C The actual configuration increases stability by creating a full d sublevel. Distributing the electrons in this way gives a diamagnetic formation.
In actual configuration the 3d sub shell is completely filled as a result, the atom gains extra stability due to diamagnetic formation. Thus the correct reason is given in option C. Hence answer is option C.

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