what is approximate size of an atom?
There is no average size for an atom, as atoms of different elements have different sizes. Some are very small and some are very large. The atoms are extremely small particles that cannot be seen by the naked eye. The size of an atom is indicated by its radius, which is known as the atomic radius. Radius of atoms is normally expressed in angstrom, which is a unit to express size objects of very small dimensions. One angstrom is equal to 10-10 m.