science medium fill in the blank

The inert pair effect is most prominent in the ________ group of p-block elements.

  1. 13
  2. 14
  3. 15
  4. 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]]

Topic Chemistry - p-Block Elements
Exam Relevance SSC CGL, Railway JE, UPSC NDA

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