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Ionic radii are inversely proportional to effective nuclear charge. Ionic radii in the nth orbit is given as rₙ = n²a₀/Z or rₙ ∝ 1/Z when n = principal quantum number Z = effective nuclear charge.

1. Ionic radii are inversely proportional to effective nuclear charge.
2. Ionic radii in the nth orbit is given as rₙ = n²a₀/Z or rₙ ∝ 1/Z.
3. None of the above.
4. None of the above.

Correct answer: Ionic radii are inversely proportional to effective nuclear charge.

Solution

Ionic radii are inversely proportional to effective nuclear charge because as the nuclear charge increases, the attraction between the nucleus and electrons strengthens, reducing the size of the ion.

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