Why is the electron configuration for copper 1s22s22p63s23p63d104s1 instead of 1s22s22p63s23p63d94s2?
A filled sublevel is more stable than a half-filled sublevel.
The arrangement of electrons with the same spin is as small as possible.
The 4s orbital has higher energy than the 3d orbital.
Electrons occupy orbitals of the highest energy levels first.
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