JEE Main Chemistry question

The radii of F, F⁻, O and O²⁻ are in the order of

(A)F⁻ > O²⁻ > F > O
(B)F > F⁻ > O > O²⁻
(C)O²⁻ > F⁻ > O > FCorrect
(D)F > O > F⁻ > O²⁻

Answer: (C)

Solution

Within period 2, O lies to the left of F, so O has a larger atomic radius than F. Anions are always larger than their parent atoms because the extra electron(s) increase electron-electron repulsion and shielding; so and .

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Question ID VK-133318