Question

Which of the following option is incorrect with respect to ionic radii ?
(a) Ti⁴⁺ < Mn²⁺ (b) ³⁵Cl⁻ < ³⁷Cl⁻
(c) K⁺ > Cl⁻¹ (d) P³⁺ > P⁵⁺

Answer 1

Explanation:

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Answer 2

(c) K⁺ > Cl⁻

Explanation:

K+ ion contains more protons than electrons, therefore has a higher nuclear charge. This will result in smaller ionic radii. Number of protons in K+ is 19 vs. 18 electrons.

Cl- ion contains less protons than electrons, therefore has a lesser nuclear charge. This will result in a bigger ionic radii than K+. Number of protons in Cl- is 17 vs. 18 electrons. Both contain 18 electrons and are thus isoelectronic ions.

Option C is the answer.