What is the electronic configuration, Chemistry

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What is the electronic configuration of Cu2+ (Z= 29) of least position:

(1) [Ar]4s1 3d8                  

(2)  [Ar]4s2, 3d10 4p1     

(3) [Ar]4s1 3d10                 

(4) [Ar]3s9         

Ans: [Ar]3s9

 


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