How Big Are Atoms?

How big are individual atoms? Atoms consist of a nucleus characterized by high density and a positive charge, surrounded by an electron cloud which carries a negative charge. They are very tiny and can only be observed under an advanced scanning tunneling microscope. Specifically, what is the size of individual atoms?

The size of an atom is approximately 10^-10 meters, or 0.00000000010 meters.

The mass of an individual atom in kilograms is around 10^-25 kg, with the nucleus comprising the vast majority of its mass (99.9%).


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