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The top documents tagged [small units of matter]
History of the Atomic Model Democritus (400 BC) Democritus (400 BC)
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Author: Seymour Simon Genre: Expository Nonfiction Big Question: Why is it important to know about the universe?
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Matter, Elements, and Compounds. Matter: Anything that takes up space and has mass. There are 92 naturally occurring elements, of these 25 are essential
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History of the Atomic Model
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