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

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 

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

[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...

Please Approve!!