Their is difference of $40$ pm in atomic radius while going from $C$ to $S i$ but there is difference of only $5$ pm while going from $S i$ to $G e$ .
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Solution

Carbon is a non-metal, silicon and germanium are metalloids, and tin and lead are poor metals. The Group 14 metalloids silicon and germanium act as electrical semiconductors, although silicon is largely non-metallic. The physical and chemical properties of germanium are very similar to those of silicon so, they have small atomic radii difference.

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