Answer: 4. N Key idea: For isoelectronic ions (all 10 electrons), the one with the lowest nuclear charge is the largest. The ions are Na^+ (Z = 11), mathrmO²⁻ (8), F^- (9), mathrmN³⁻ (7). Fewer protons hold the same 10 electrons less tightly, so mathrmN³⁻ is largest. Option 4.

Topic: Atomic and ionic radii· Classification of Elements and Periodicity in Properties

The element expected to form largest ion to achieve the nearest noble gas configuration is :

1. Na

2. O

3. F

4. N

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Answer: 4. N

Key idea: For isoelectronic ions (all 10 electrons), the one with the lowest nuclear charge is the largest.

The ions are \(\mathrm{Na^+}\) (Z = 11), \(\mathrm{O^{2-}}\) (8), \(\mathrm{F^-}\) (9), \(\mathrm{N^{3-}}\) (7). Fewer protons hold the same 10 electrons less tightly, so \(\mathrm{N^{3-}}\) is largest. Option 4.

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The element expected to form largest ion to achieve the nearest noble gas configuration is :

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