Ionic size (isoelectronic series): Arrange the ionic radii of N³⁻, O²⁻, F⁻, and Na⁺ in the correct order. All have 10 electrons; size depends on nuclear charge Z. Choose the correct option.

Q: Ionic size (isoelectronic series): Arrange the ionic radii of N³⁻, O²⁻, F⁻, and Na⁺ in the correct order. All have 10 electrons; size depends on nuclear charge Z. Choose the correct option.

Concept/Approach For an isoelectronic series (same electrons), ionic radius decreases with increasing nuclear charge (Z). Z increases from N (7) → O (8) → F (9) → Na (11). Hence size: N³⁻ > O²⁻ > F⁻ > Na⁺.

Difficulty: Easy

Na⁺ > F⁻ > O²⁻ > N³⁻
N³⁻ > O²⁻ > F⁻ > Na⁺
F⁻ > O²⁻ > N³⁻ > Na⁺
O²⁻ > N³⁻ > F⁻ > Na⁺

Correct Answer: N³⁻ > O²⁻ > F⁻ > Na⁺

Explanation:

Concept/Approach
For an isoelectronic series (same electrons), ionic radius decreases with increasing nuclear charge (Z). Z increases from N (7) → O (8) → F (9) → Na (11). Hence size: N³⁻ > O²⁻ > F⁻ > Na⁺.

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