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The electronic configuration of copper can be represented in this/these way/ways

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

 2) [Ar] 3d10 4s1 

3) 1s2 2s2 2p6 3s2 3p6 4s2 3d9 

1) Only 1 & 2 are correct 

2) Only 2 is correct 

3) Only 2 and 3 are correct 

4) Only 1 and 3 are correct

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