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Home › ICSE Class 9 › chemistry › The Periodic Table › Across a period, the size of an atom:

Across a period, the size of an atom:

AIncreases
BVaries randomly
CStays the same
DDecreases
Answer & Solution
Correct answer: A. Increases
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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