Question

Why do d block elements form coloured ions

Answer 1

Transition elements have partially filled d orbitals. We also know that when electrons jump from one orbital to another light is emitted due to which the compounds of transition elements seem to be colored compounds.

Answer 2

Answer:

The color of the transition metal ions is due to the presence of unpaired or incomplete d-orbitals. The absorption of visible light and hence the colored nature of the transition metal cations is due to the promotion of one or more unpaired d-electron from a lower to a higher level within the same d-subshell.