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(B) Atomic radii increase as we move down the group due to the addition of an extra energy shell. Although the nuclear charge also increases,the effec

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$Na, K$

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(B) Atomic radii increase as we move down the group due to the addition of an extra energy shell. Although the nuclear charge also increases,the effect of the addition of a new energy shell predominates. The increase in atomic radius is most significant when moving from $Na$ ($Z=11$,$3s^1$) to $K$ ($Z=19$,$4s^1$) because the transition from the $n=3$ shell to the $n=4$ shell involves a substantial increase in shielding and distance from the nucleus compared to subsequent transitions in the group. Therefore,the largest difference in radii is observed for the pair $Na, K$.

The largest difference in atomic radii is found in the case of which pair?

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