Respuesta :
The reason why transition metal in particular are colorful is because they have unfilled or either half filled d orbitals.
Why are colored solutions of metal ions common among transition elements but not main-group elements?
Most of complexes of transition elements are coloured due to d-d transition. This is because of the absorption of radiation from visible light region to promote an electron from one of the d-orbitals to another.
Different charges of one transition metal can result in different colors.
They absorb radiation from visible region of light to promote an electron from a lower energy d-orbital to a higher energy d-orbital .
The energy of excitation corresponds to the frequency of light absorbed and the colour of the light absorbed.
To learn more about transition elements, refer
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