Diagonal Relationship
Diagonal relationship observed between Li and Mg due to:
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About This Question
- Subject
- chemistry
- Chapter
- classification of elements and periodicity in properties
- Topic
- diagonal relationship
- Difficulty
- Medium
- Year
- 2025
Solution
Correct Answer:
Similar ionic sizes and polarizing power
- Definition: Elements of the second period sometimes show similarities to elements of the third period in the next group.
- Compensating Trends:
- Moving right across a period: Size decreases, electronegativity increases.
- Moving down a group: Size increases, electronegativity decreases.
- Result: These two opposing changes effectively cancel out when moving diagonally.
- Specifics: Li and Mg have very similar ionic radii (0.76 Å and 0.72 Å) and comparable charge/radius ratios (polarizing power).
- Impact: They share chemical properties like formation of nitrides and similar solubilities of carbonates.
This medium difficulty chemistry question is from the chapter classification of elements and periodicity in properties, covering the topic of diagonal relationship. It appeared in the 2025 exam.
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