which of these is electronic configuration of Cu2+ ? its ans. is [Ar]3d^9.what does this mean?

which of these is electronic configuration of Cu2+ ? its ans. is [Ar]3d^9.what does this mean?


3 Answers

Rathod Shankar AskiitiansExpert-IITB
69 Points
11 years ago

Dear Vaishal Shah,


Copper that is CU+2  has 27 elctrons  = Argon(18) + 9 electrons(in 3d orbit shell)  = 27 electons


so both contains same electrons 

Cu has 29 electrons....and argon has 18 electrons...





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Rathod Shankar Singh

IIT Bombay 

vijesh jayan
49 Points
11 years ago

Atomic no of Cu is 29

1s2 2s2 2p6 3s2 3p6 4s2 3d9

due to transition properties the electron pair exites and the configuration becomes


1s2 2s2 2p6 3s2 3p6 3d10 4s1

Cu2+ means lossing 2 e

so the resulting config is

1s2 2s2 2p6 3s2 3p6 3d9

1s2 2s2 2p6 3s2 3p6 is config for Argon

Cu2+ is [Ar] 3d9

Ritvik Gautam
85 Points
11 years ago

[Ar]3d9 ... means that the electronic configuration of Cu2+ is same as that of the element Argon plus 3d9...

Electronic configuration of Argon is .... 1s2 2s2 2p6

So, that makes the electronic configuration of Cu2+   as 1s2 2s2 2p63d9 ....


We generally write this way so that we dont have to write the electronic configuration again and again.... Also, generally we use Noble componds in such a way...



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