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Phosphorus. Sample of phosphorus (P), a non-metal element from group 15 of the periodic table. In elemental form it has several allotropes (forms): white, black, red and violet. This is the violet (purple) form. Phosphorus compounds are used in fertilizers, detergents, pesticides, nerve agents, and matches. It is also one of the elements found in many biological molecules that are essential for life.
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