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As you move across the period the atomic radius gets smaller and as you move down the column the radius gets bigger. So silver has a larger atomic radius than zinc. This is because when you add a proton, then the nucleus pulls the electrons in stronger, pulling the atoms cell close to the nucleus. So then the atomic radius decreases, and when you take away a proton then the atomic radius increases.
Across a period the radius gets smaller while down a group it gets bigger. Since silver is lower and to the left, it is bigger than zinc in both aspects. Comparing elements like nitrogen and sulfur would be more ambiguous, however it's not likely that questions like that would be asked.
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