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if you need the smallest element in terms of size ..then the answer is florine
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atomic size in terms of radius decreases as one moves across a period. So Florine has less radius as compared to Lithium. Lithium is smallest in terms of mass and atomic number.
Lithum is the smallest element becoz its atomic number is 3 and configuration is 1s2 2s1 so it has only 2 shells ao it is tge smallest element is lithium
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