Since we know that atomic size gradually decreases from left to right across a period of elements because, within a period or family of elements, all electrons are added to the same shell. However, at the same time, protons are being added to the nucleus, making it more positively charged. The effect of increasing proton number is greater than that of the increasing electron number; therefore, there is a greater nuclear attraction. And cause decrease in atomic radius
Atomic radius increases from top to bottom within a group. This is caused by electron shielding .
Also we know that if an element loss there electrons i.e increase in number of protons and decrease in number of electrons , the atomic size will be decreased due to increase in attraction between increased number of protons and decreased number of electrons .
And when they gained electrons the atomic size increased due increase in repulsion between electrons .
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