Chemistry of Colour. Chemical Ideas 6.9. Recapping from earlier. Coloured substances absorb radiation in the visible region of the EM spectrum. Absorb energy - outermost electrons promoted to excited state. Same electrons involved in bonding or lone pairs.
Chemical Ideas 6.9
Yellow Blue Green Violet
[Ni(H2O)6]2+(aq) + 6NH3(aq) [Ni(NH3)6]2+(aq) + 6H2O
light green lilac/blue