alleryStart learning →Why is copper still counted as a transition element?
AIt has a completely full 4s
BIts Cu2+ ion has a partly filled 3d9
CIt forms only colourless salts
DIt shows no variable valency
Answer & Solution
Correct answer: B. Its Cu2+ ion has a partly filled 3d9
IUPAC defines a transition metal as one whose ions have an incomplete d subshell, and Cu2+ is 3d9.
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