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Plantilla:Juliol article de Química

Mena d'urani
Mena d'urani

L' urani és un element químic que en la taula periòdica té el símbol U i el nombre atòmic 92. És pesant, blanc-argentí, tòxic, metàl·lic, i radioactiu de forma natural. Pertany a la sèrie dels actínids i el seu isòtop urani-235 és usat com a font d'energia en els reactors nuclears i les armes nuclears. L'Urani es troba en petites quantitats a les roques, el sòl, l'aigua, les plantes, i en els animals (inclús en els humans).

És l'element químic més pesat d'origen natural que es troba sobre la Terra. Va ser descobert al 1789 per M. H. Klaporfth que el va anomenar així en honor del planeta Urà que acabava de ser descobert al 1781.

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Plantilla:Juliol article de Química
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