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White phosphorus is a colourless-to-white waxy solid, with a garlic like smell that is flammable in air and glows in the dark. Phosphorus is a non-metallic chemical element with symbol P and atomic number 15. As a mineral, it is almost always present in its maximally oxidised state, as inorganic phosphate rocks. Elemental phosphorus exists in two major forms—white phosphorus and red phosphorus—but due to its high reactivity, phosphorus is never found as a free element on Earth.