In two or more complete sentences describe how atomic radius changes as you move down a group in the periodic table and why.

When we move across the period from left to right then there is decrease in atomic raduis.

This is due to increase in number of protons and electrons across a period.

Since electrons are added in same energy level, therefore, they get pulled closer to the nuvleus because of more number of protons which carry a positive charge.

As a result, there is shrinkage in size from left to right across the period.

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