Question

Q.5 Transition elements are those elements which have unpaired electron(s) in its
ground state or any one of its excited state. [Ar]3d104s' is the electronic
configuration of Cu, why it is called transition element, although it does not has
unpaired electron in d-orbital.
(a) The electronic configuration of Cu is [Ar]3dº4s. So we find one unpaired
electron in d orbital hence it is transition element.
(b) In the electronic configuration of Cu we find unpaired electron in 4s-orbital,
hence it is transition element.
(c) Cu show two oxidation state +l and +2, in +2 oxidation state it has unpaired
electron in d-orbital and hence it is transition element.
(d) None of the above.​

Answer 1

Answer:

Cu2+ has structure [Ar]3d⁹. So, copper is a transition metal because Cu2+ ion has incomplete d orbital.

Explanation:

An element whose atom has a partially filled d sub-shell, or which can give rise to cations with an incomplete d sub-shell is called Transition element.

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