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Colour of Actinides

Generally tra...

Question

Generally transition elements form coloured compounds. But Sc³⁺ forms colourless compounds. Justify.

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Solution

When there is d⁰ configuration and d¹⁰ configuration, there is no electron in the d orbital and it shows colourless.
Sc²¹ has electronic configuration of [Ar]3d¹4s².
Sc⁺³has [Ar] configuration. That means no free electron. So its colourless.

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Colour of Actinides

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