how atomic size change when we move down in a group of modern periodic table?
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Answer: when we go down in a group, the no. of outermost shells increases. So, the atomic size increases. And as go left to right in a group, nuclear charge is increased by one. Thus, attraction of nucleus towards the outermost shell increases. Thus, atomic size decreases.
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The size of atom or the atomic radius is a periodic property. In the modern periodic table as we move down from upper part, the size of atom increases. In a same group, the lower we move from the upper part, a new shell is added to the outer layer. These added shells increase the size of atom.
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