Question

Why transitions elements form coloured compounds

Answer 1

Transition elements have 3d orbitals with the same energy level however when molecules/ligands form dative covalent bonds with a metal ion, the electron repulsion causes the 3d orbitals to split into lower and higher energy levels.

Answer 2

Answer:

Explanation:

Colored compounds of transition elements are associated with partially filled (n-1)d orbitals. ... During this d-d transition process, the electrons absorb certain energy from the radiation and emit the remainder of energy as colored light. The color of ion is complementary of the color absorbed by it