alleryIn what unit is atomic radius expressed, defined as the distance between the nucleus and the outermost shell?
APicometre
BKilogram
CCoulomb
DAmpere
Answer & Solution
Correct answer: A. Picometre
1. Atomic radius measures atomic size as a distance.
2. It is expressed in picometre (pm), where $1\,\text{pm} = 10^{-12}\,\text{m}$.
3. This unit is smaller than a nanometre.
4. Rule out C and D: gram and mole measure mass and amount, not length.
_Source: Balbharati (Maharashtra Board) Class 10 Science & Technology, Ch 2 "Periodic Classification of Elements", p.34_
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