` [T_i (H_2O)_6]^(3+ ) ` is coloured ,while `[Sc(H_2O)_6]^(3+) `is colourless -explain

Explanation

` Ti^(2) =22 : 3d ^(2) 4s ^(2) `
` Ti^(3+ ) : 3d ^(1) 4s ^(0) `
` [Ti (H_2O)_6]^(3+ ) ` has one unpaired electron so it is coloured.
` Sc^(2=2l ): 3d ^(1) 4s^(2) `
` Sc^(3+) : 3p^(6) 3d^(0) 4s^(0) `
` [Sc(H_2O)_6]^(3+) ` has no unpaired electron so it is colourless.