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i can only answer the compounds and elements, because im not quite sure on the mixtures! Elements and compounds are alike because they are both pure substances but elements consist
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An element is any amount of one particular kind of atom. A compound is a combination of two or more different elements. A mixture is a substance made by combining two or more compounds
http://wiki.answers.com/Q/What_is_the_difference_b...
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Elements are atoms that consist of different protons. They are the simplest thing that defines an atom. The only thing that defines them is the number of protons, electrons and neutrons
http://wiki.answers.com/Q/What_is_the_difference_b...
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An element is a substance in which -same type of atoms added together.Eg: H2, Na, C & Ne etc. A compound is a substance in which -different atoms added together in a fixed ratio.Eg
http://wiki.answers.com/Q/What_you_is_the_differen...
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