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Atoms and Their Sizes

Atoms and their sizes_HERO AMNH/D. Finnin

Exhibition Text

Atoms range in size from a few tenths of a nanometer to several nanometers across. More than 10 million hydrogen atoms would fit across the head of a pin. Atoms are the basic constituents of molecules, cells, humans, and planets. The human body contains about a billion billion billion (10^27) atoms.