The atomic radii is the measure of the size of the atoms in a chemical element. This is the distance from the nucleus to the boundary of the electrons' cloud.
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Fluorine, because it has only two energy levels. All the rest have 3 to 7 energy levels, which increases their atomic radii.
2 radii = one diameter
the single form of radii is radius
It is radii which is the plural of radius
NoneAdditional Information:-Unless it is the diameter of the circle which is its the largest chord then it will have a length equal to two radii (but the chord itself has no radii).