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Solution


Q.

The element expected to form largest ion to achieve the nearest noble gas configuration is           [2023]
1 N  
2 Na  
3 O  
4 F  

Ans.

(1)

N3-,O2-,F- and Na+ have 10 electrons each, hence these are isoelectronic. For isoelectronic species, the size of the species decreases as the nuclear charge increases. Hence, the size decreases as  N3->O2->F->Na+

Hence, among the given elements, nitrogen is expected to form the largest ion to achieve the nearest noble gas configuration.