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13:31 23 mar 2013 [[File:Phosphorus.jpg|thumb|Las cuatro formas alotrópicas del fósforo: blanco, rojo (las dos más comunes), negro y violeta]]
'''Alotropía''' es la tendencia de [[sustancia]]s por venir en diferentes alótropos. Alótropos son formas físicas diferentes del mismo elemento. [[Fósforo]], por ejemplo, forma alótropos diversos. The most common ones are white phosphorus and red phosphorus. White phosphorus is a pale yellow waxy solid that is highly toxic. It spontaneously ignites in air and glows in the dark. It is made of P<sub>4</sub> molecules, or four phosphorus atoms in one white phosphorus molecule. White phosphorus can be heated in a vacuum to make red phosphorus. Red phosphorus is a reddish-purple crumbly solid that is relatively nontoxic. It burns in air, but at a high temperature. It is made of chains, or [[polymer]]s, of P<sub>4</sub> molecules.
[[Categoría:Química]]
[[en:Allotropy]]
[[pt:Alotropia]]
