alleryStart learning →Across a period, the size of an atom:
AIncreases
BVaries randomly
CStays the same
DDecreases
Answer & Solution
Correct answer: D. Decreases
1. Across a period, electrons enter the same outer shell.
2. Nuclear charge increases as protons are added.
3. The increased pull contracts the outer shell.
4. So atomic radius decreases across a period.
_Source: Selina Concise Chemistry ICSE Class 9, Ch 5 'The Periodic Table'_
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