(A) As we move down a group in the periodic table,the number of shells increases,which leads to an increase in the atomic radius. As we move from left

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$(i)$ Increases continuously; $(ii)$ Decreases continuously

(A) As we move down a group in the periodic table,the number of shells increases,which leads to an increase in the atomic radius. As we move from left to right across a period,the effective nuclear charge increases while the number of shells remains the same,which leads to a decrease in the atomic radius.

Class 11 Chemistry Classification of Elements and Periodicity in Properties Atomic and Ionic radii

Easy

In the main group elements $(i)$ as we proceed down the same group in the periodic table and $(ii)$ as we proceed from left to right in the same period,the atomic radius

A
$(i)$ Increases continuously; $(ii)$ Decreases continuously
B
$(i)$ Decreases continuously; $(ii)$ Increases continuously
C
$(i)$ Increases continuously; $(ii)$ Decreases up to the group $IV$ and then increases up to the end of the period.
D
$(i)$ Decreases continuously; $(ii)$ Decreases up to the group $IV$ and then increases up to the end of the period.