Question

why is Sc³ colurless while Ti³+ coloured?
Atomic number : Sc =21, Ti = 22​

Answer 1

Answer:

Sc3+is colourless due to d0 case

Explanation:

The electronic configuration of Sc is 1s2 2s2 2p6 3s2 3d1 4s2

For Sc3+ configuration becomes 1s2 2s2 2p6 3s2 3d0 4s0

Colour in do and d10 case is only due to colour spectra in only very few compounds

Ti3+ on the other hand has d1 case and shows colour due to d-d transition

Answer 2

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1] The electronic configuration of Sc³+ is [ Ar ] 3d°4s°

2] The electronic configuration Ti³+ is [ Ar ] 3d¹4s°

3] Colour can be explained due to d-d transition state ( which is in Ti³+)

4] Ti³ has an unpaired electron and it is purple in colour due to d-d transition.

5] Sc³+ has no unpaired electron and there us no d-d transition.

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