alleryWhat is the trend in atomic radius across a period from left to right?
ADecreases
BIncreases
CStays the same
DFirst increases then decreases
Answer & Solution
Correct answer: A. Decreases
1. Across a period, electrons enter the same outer shell.
2. Nuclear charge increases as protons are added.
3. The stronger nuclear pull contracts the electron cloud.
4. So atomic radius decreases across a period.
_Source: Selina Concise Chemistry ICSE Class 10, Ch 1 'Periodic Table' (aplustopper.com extract)_
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