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The Atom
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Atoms are the smallest units of matter that have all the characteristics of an element. All matter (solid, fluid or gaseous) consists of elements.
For example, an iron atom is the smallest unit of iron that has all the characteristics of the element iron. A helium atom (right) is the smallest unit of helium that has all the characteristics of the element helium.
Atoms are the building blocks of everything in the universe.
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