Formula elektronike për jonin \(\text{Cu}^{2+}\) është: \((Z_{\text{Ar}} = 18)\)
A) \([\text{Ar}]3d^{10}\)
B) \([\text{Ar}]3d^9\)
C) \([\text{Ar}]3d^9 4s^2\)
D) \([\text{Ar}]3d^{10}4s^1\)