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The inert pair effect is most prominent in the ________ group of p-block elements.
- 13
- 14
- 15
- 16
Answer: 13
In Group 13 (B, Al, Ga, In, Tl), ns² electrons resist participation in bonding down the group. Tl⁺ is more stable than Tl³⁺ due to inert pair effect. Important for periodic trends. [[NCERT Chemistry Class 11]]