how can a copper have 2 valencey
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According to Aufbau Principle, 4s orbital is filled before 3d orbital. Copper is one of the transition elements and thus exhibits variable oxidation states. It has two valencies: +1 and +2 and the corresponding atoms are termed as Cuperous (+1 valency) and Cupric (+2 valency).
ELECTRONIC CONFIGURATION OF COPPER :-
[Ar] 3d10 4s1 .
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