MARTYN F. CHILLMAID / SCIENCE PHOTO LIBRARY MARTYN F. CHILLMAID / SCIENCE PHOTO LIBRARY
Transition metal salts. Clockwise from upper left: copper (II) sulphate, cobalt (II) chloride, chromium (III) chloride, iron (III) chloride, and nickel nitrate. Salts are compounds formed by reacting a metal (or metal compound) with an acid. Forming colourful salts is one characteristic of the transition metals.
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