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Why is Copper considered as transition m...

Why is Copper considered as transition metal ?

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According to definition of transition elements are those elements in which incompletely filled d-subshell in the ground state, they show many oxidation state.
Cu has electronic configuration : [Ar] `3 d^(10) 4s^(1)`

`Cu^(+) : [Ar] 3d^(10)`
`Cu^(2+) : [Ar] 3d^9`

As `Cu^(2+)` has partly filled d-orbitals, it is transition metal.
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