The atomic radius in the periodic table decreases across the period and increases down the group.Ītomic radius decreases across the period The bigger the atomic size, the larger the atomic radius. Then depending on atomic size, the atomic radius of the two atoms are calculated. So to calculate the atomic radius, at first the distance between the nuclei is measured. In the same way the anions can have lesser radius that the radius of its original neutral atom.The ionic radius is thus reduced than atomic radius. However the nucleus attract the rest of the electrons more tightly towards the nucleus.
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