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Largest difference in radii is found in case of the pair
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\(\mathrm{Na}, \mathrm{K}\)
Atomic as well as ionic radii increases from \(\mathrm{Li}\) to Fr due to the presence of one extra shell of electron.
\(\begin{array}{llllll} & \mathrm{Li} & \mathrm{Na} & \mathrm{K} & \mathrm{Rb} & \mathrm{Cs} \\ \text { Metallic radii (pm) } & 152 & 186 & 227 & 248 & 265\end{array}\)
\(\begin{array}{llllll} & \mathrm{Li} & \mathrm{Na} & \mathrm{K} & \mathrm{Rb} & \mathrm{Cs} \\ \text { Metallic radii (pm) } & 152 & 186 & 227 & 248 & 265\end{array}\)
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