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Among the period-2 elements Li, Be, B, C, N, O whose atomic radii are 152, 111, 88, 77, 74, 66 pm, which element has the largest atom?
ACarbon
BOxygen
CLithium
DBoron
Answer & Solution
Correct answer: C. Lithium
1. Largest atom means the greatest atomic radius.
2. The listed radii peak at lithium, 152 pm.
3. Lithium sits at the left of period 2, where radius is largest.
4. Rule out B: oxygen at 66 pm is the smallest, being further right.
_Source: Balbharati (Maharashtra Board) Class 10 Science & Technology, Ch 2 "Periodic Classification of Elements", p.34_
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