AIPMT PRELIMS2003Chemistry-Periodic Table
AIPMT PRELIMS 2003 Chemistry Trends in Ionic Radii MCQ Question
Type: MCQ-conceptual-Medium-Class 11
The ions O²⁻, F⁻, Na⁺, Mg²⁺ and Al³⁺ are isoelectronic. Their ionic radii show :
A
A significant increase from O²⁻ to Al³⁺
B
A significant decrease from O²⁻ to Al³⁺
C
An increase from O²⁻ to F⁻ and then decrease from Na⁺ to Al³⁺
D
An decrease from O²⁻ to F⁻ and then increase from Na⁺ to Al³⁺
Correct Answer
Option B
Detailed Explanation
As the nuclear charge increases from O²⁻ to Al³⁺, the ionic radius decreases due to increased attraction between electrons and nucleus.
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