Question

give the reason why transition elements form coloured compounds..

Answer 1

Transition elements have unpaired electrons in the anti penultimate d orbital.

So due to the absorption and emission of UV Ray's they exhibit colour properties.

Answer 2

Hey mate ☺️

$\huge \red {Ur Answer}$

The reason why transition metal in particular are colorful is because they have unfilled or either half filled d orbitals.

There is Crystal field theory which explains the splitting of the d orbital, which splits the d orbital to a higher and lower orbital.

Now, the electrons of the transition metal can "jump".

Hope u understand ♥️