Exploring the Building Blocks of Matter: How Small Are Atoms?

Atoms are incredibly small, invisible to the naked eye and even to microscopes. To illustrate their size, a piece of paper's thickness is made up of thousands of atoms. A small coin contains billions of atoms. Atoms can join to form molecules, such as water, which consists of two hydrogen atoms and one oxygen atom. A single drop of water contains trillions of molecules, highlighting the vast number of molecules in larger bodies of water like lakes.

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