Question

explain in brief - why the atomic size of an element increases while going down a group?

Answer 1

it increases because no. of shells will increase as a result the distance between neutron and last shell valence electron also increase

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Answer 2

The atomic size increases as we go down the group because the no of shells increase down the group and hence the atomic size increases
Where as across the period it decreases due to forces of attraction between nucleus and electrons

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