Question

Which of the following is electronic configuration of Cu2+ (Z = 29) ?

• A. [Ar]4s1 3d8
• B. [Ar]4s2 3d10 4p1
• C. [Ar]4s1 3d10
• D. [Ar] 3d9

Answer 1

Answer: (D)

$Ar$ 3d9

Answer 2

Cu : 1s22s22p63s23p63d104s1.

$\therefore$ Cu2+ : 1s22s22p63s23p63d9 or [Ar]3d9.