The ions O2- , F- , Na+, Mg2+ and Al3+ are isoelectronic. Their ionic

1.	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) a decrease from O2- to F- and then increase from Na+ to Al3+
Answer» The correct option is : (b) a significant decrease from O^2- to Al³⁺ Explanation: Amongst isoelectronic ions, ionic radii of anions is more than that of cations. Further size of the anion increases with increase in -ve charge and size of cation decreases with increase in +ve charge. Hence, correct order is O^2- > F^- > Na⁺ > Mg²⁺ > Al³⁺

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) a decrease from O2- to F- and then increase from Na+ to Al3+

Answer»

The correct option is : (b) a significant decrease from O^2- to Al³⁺

Explanation:

Amongst isoelectronic ions, ionic radii of anions is more than that of cations. Further size of the anion increases with increase in -ve charge and size of cation decreases with increase in +ve charge. Hence, correct order is

O^2- > F^- > Na⁺ > Mg²⁺ > Al³⁺

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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) a decrease from O2- to F- and then increase from Na+ to Al3+

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