Which of the following orders of ionic radii is correctly represented

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Which of the following orders of ionic radii is correctly represented

Options

(a) H⁻ > H⁺ > H
(b) Na⁺ > F⁻ > O²⁻
(c) F⁻ > O²⁻ > Na⁺
(d) Al³⁺ > Mg²⁺ > N³⁻

Correct Answer:

none

Explanation:

Cations lose electrons and are smaller in size than the parent atom whereas anions add electrons and are larger in size than the parent atom. Hence the order is H⁻ >H>H⁺.
For isoelectronic species the ionic radii decreases with increase in atomic number i.e nuclear charge.
Hence the correct orders are O²⁻>F⁻>Na⁺ and N³⁻>Mg²⁺>Al³⁺

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Topics: Classification of Elements and Periodicity (94)
Subject: Chemistry (2512)

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