Group 13 Elements
Which statement correctly explains why Tl(I) compounds are generally more stable than Tl(III) compounds?
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About This Question
- Subject
- chemistry
- Chapter
- p-block elements
- Topic
- group 13 elements
- Difficulty
- Easy
- Year
- 2025
Solution
Correct Answer:
Inert pair effect makes 6s2 electrons less available for bonding
Down Group 13, the ns2 electrons are increasingly reluctant to participate in bonding because of poor shielding by intervening d and f electrons. This inert pair effect is strongest in thallium, so oxidation state +1 becomes more stable than +3. Hence Tl(I) compounds are thermodynamically favored compared to Tl(III) compounds.
This easy difficulty chemistry question is from the chapter p-block elements, covering the topic of group 13 elements. It appeared in the 2025 exam.
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