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Write electronic configuration of Cl-(Z=17),Cu2+(Z=29),Cr3+(Z=24)

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Cl- =1s2 2s2 2p6 3s2 3p6

Cu2+=1s2 2s2 2p6 3s2 3p6 3d9 

Cr3+= 1s2 2s2 2p6 3s2 3p6 3d3

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