CHARLES D. WINTERS / SCIENCE PHOTO LIBRARY CHARLES D. WINTERS / SCIENCE PHOTO LIBRARY
Lithium reacting with water. Lithium (Li) is a highly reactive metallic element. It is light enough to float on water, with which it reacts violently to produce hydrogen (H2) gas and lithium hydroxide (LiOH). Bubbles of H2 can be seen around the piece of metal.
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