alleryAs one moves from left to right across a period, how does the atomic radius of the elements change?
ADecreases
BIncreases
CRemains constant
DFirst increases then decreases
Answer & Solution
Correct answer: A. Decreases
1. Across a period the shell number stays the same but protons increase.
2. The greater nuclear charge pulls the electron cloud inward.
3. Therefore atomic radius decreases from left to right across a period.
_Source: Samacheer Kalvi (TN SCERT) Class 10 Science, Unit 8 Periodic Classification of Elements "Atomic Radius", p.117_
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