element - The simplest form of a substance, mixture - Two or more substances physically combined together, compound - two or more elements chemically combined together, oxide - a compound made of an element reacted with oxygen, molecule - two or more atoms joined together, diatomic - two atoms joined together, such as 02, H20 - the formula for water, exothermic - a reaction that gives off heat, endothermic - a reaction that takes in heat,

elements

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