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SCIENCE PHOTO LIBRARY SCIENCE PHOTO LIBRARY
Potassium burning in water. When water and metallic potassium come into contact they react to form potassium hydroxide and hydrogen gas. The reaction is exothermic, or heat-producing. Enough heat is generated to melt the potassium and ignite the hydrogen. The flame shows the typical purple colour of potassium ions. This reaction is characteristic of the Group I elements of the periodic table.
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