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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
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!!
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