Why are some complex ions coloured?
Ligands causes d orbitals to split. Electrons get excited to higher energy levels from ground state. Visible light is absorbed to promote electron to a higher energy level and the light that is not absorbed is transmitted to give the colour of the ion.
JO
Related Chemistry A Level answers
All answers ▸What are the differences between covalent and ionic bonding?
Calculate the number of moles in a sample of 113.47g of Ca(HCO3)2.
Why is there a difference in mechanism between tertiary halogenoalkanes and primary halogenoalkanes in nucleophilic substitution?
What is meant by an ion being 'polarising' - and how does that determine if something is ionic/covalent?