Atom radius is expressed in the unit.....
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The atomic radius (r) of an atom can be defined as one half the distance (d) between two nuclei in a diatomic molecule. Atomic radii have been measured for elements. The units for atomic radii are picometers, equal to 10-¹²meters.
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Nanometer (nm)
Step-by-step explanation:
Since atom is the smallest unit of life.
1nm=10m^-9
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