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 ▸Why are teachers now saying electrons are in orbitals? I thought they moved around shells?
Describe and explain the trend in first ionisation energy down group 2 of the periodic table.
What is electronegativity?
How is the electrophile formed for the nitration of benzene??