A) \[[Ar]3{{d}^{9}}4{{s}^{2}}\]
B) \[[Ar]3{{d}^{10}}4{{s}^{1}}\]
C) \[[Ar]3{{d}^{5}}4{{s}^{2}}\]
D) \[[Ar]3{{d}^{6}}4{{s}^{2}}\]
Correct Answer: B
Solution :
The expected electronic configuration of Cu (29) is \[[Ar]\ 3{{d}^{9}}4{{s}^{2}}\] but actually it is found to be \[[Ar]\ 3{{d}^{10}}4{{s}^{1}}\]. This is because fully filled d orbitals are more stable than incompletely filled d-orbitals. So there is a migration of one \[{{e}^{-}}\], from 4s orbital to 3d orbital to give a more stable configuration.
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