Simplified Chemistry


A colorless to white crystalline substance which occurs naturally as the mineral kalunite and...

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عناصر الجدول الدوري


A chemical element, Ac, atomic number 89, and atomic weight 227.0. Actinium was discovered...

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Aluminium – Aluminum

Aluminum A metallic chemical element, symbol Al, atomic number 13, atomic weight 26.98154, in...

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