Question

Why Zn2+ ions are colourless while Ni- ions are
green and Cu2+ ions are blue ? ​

Answer 1

Cu2+ has an unpaired electron (its configuration is [Ar] 3d9), whereas Zn2+ has all paired electrons (configuration [Ar] 3d10). ... Also, the unpaired electron in the copper ion allows electron transition in the visible region to take place, so the ion is coloured

Answer 2

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