Question

what is size of an atom?​

Answer 1

units for atomic radii are picometers, equal to 10−12 meters. As an example, the internuclear distance between the two hydrogen atoms in an H2 molecule is measured to be 74 pm. Therefore, the atomic radius of a hydrogen atom is 742=37 pm 74 2 = 37 pm .

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Answer 2

The size of an atom is very very small. Size is about 10^-10 metres. Different elements have different sizes of atoms.