MARTYN F. CHILLMAID / SCIENCE PHOTO LIBRARY MARTYN F. CHILLMAID / SCIENCE PHOTO LIBRARY
Zinc nitrate crystals, Zn(NO3)2. Although zinc is positioned in the transition metals block, its salts are not coloured as its outer d electron shells are full. It is transitions between these shells that give rise to the coloured salts of the other transition metals.
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