Question

Why do transition element form coloured compounds?

Answer 1

transition elements form coloured compound because they have parcially filled d orbital .
since they have d orbital they can form various complexed . when these elements come in contact with other ions their d orbital split into higher and lower energy level , while forming bond electron jump lower to higher to bond they require energy and they absorb wavelength due to which color is emitted and compound looks colorful.

Answer 2

1. When light falls on the transition element compounds electrons excite and electrons absorb energy and excite.
2. When these electrons de-excite they release visible light wavelength.