alleryAtomic size generally decreases as one moves across a:
APeriod
BGroup
CBlock
DPanel
Answer & Solution
Correct answer: A. Period
1. Added electrons enter the same outer shell.
2. The effective nuclear charge rises at the same time.
3. So atomic size decreases across a period.
_Source: syllabus Chemistry Part I, Chapter 3, Classification of Elements and Periodicity in Properties._
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