Chemical substance From Adfunk My News

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A chemical substance is any material substance used in or obtained by a process in chemistry: * A chemical compound is a substance consisting of two or more chemical elements that are chemically combined in fixed proportions. * A chemical element is a substance that cannot be divided or changed into different substances by ordinary chemical methods. The smallest particle of such an element is an atom, which consists of electrons centered around a nucleus of protons and neutrons. * A molecule is ... (more)  

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Last update: 05/26/2005

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