Question

Why the transition metals generally form coloured compound ?​

Answer 1

Answer:

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".

I hope this helps you....

Answer 2

because they have half filled orbitals.