Answer» - V3+[Ar]18 3d2 -(green) Since there are two unpaired electrons available, for d → d transition, it will show a Green colour.
- Sc3+[Ar]183d° (colourless/white). Since there are no unpaired electrons in the 3d subshell, it will not show colour.
- Cr3+[Ar]18 3d3 – (violet) There are three unpaired electrons in the 3d subshell, hence due to d → d transition, it will show violet colour.
- Cu2+[Ar]18 3d9(blue) It has one unpaired electron that can undergo a d → d transition, hence it will show the colour blue
- Ti3+ [Ar]18 3d1 (purple) It has one unpaired electron that can undergo a d → d transition, hence it will show the colour purple.
- Cu1+ [Ar]18 3d10(colourless) There are no unpaired electrons in the 3d subshell, hence it will not show colour.
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