Atoms are inconceivably small particles that form the building blocks of matter, the smallest complete units of which all matter is made. To visualize the size of an atom, one can think of placing millions of them on the sharpened end of a pencil and still having room for more. Everything about us, everything we can see or touch, is made of atoms--the food we eat, the atmosphere, the water in the oceans, the smoke coming out of the chimney.
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