Question

Why copper is regarded as a transition element though it has completely filled d-subshell?

Answer 1

HIYA MATE :)

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~ although copper has 3d¹⁰ configuration, it can lose one electron from this arrangement. Hence Cu⁺²has 3d⁹configuration...

~ so according to the definition that transition metal cations have partially filled  (n-1)d subshell,

~copper can be regarded as the transition element

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Answer 2

Answer:

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