Transition metal compounds. These have intense colours because of the electronic structure of transition metals,and the hydration of most of the compounds with water. The formulae for the bottom row are (left to right): nickel sulphate (NiSO4.6H2O),cobalt chloride (CoCl2.6H2O),copper (II) sulphate (CUSO4.5H2O),potassium iron (III) cyanide (also called potassium hexacyanoferrate (III),K3[Fe{CN}6]). At upper left is iron (II) sulphate (FeSO4.7H2O). At upper right is chromium (III) sulphate (Cr2[SO4]3) | |
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Credit: | Science Photo Library / Andrew Lambert Photography |
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