How many of the following statements are correct.

Question

TestHub · Accepted Answer

Option A is correct: Cations have higher electron affinity (EA) than neutral atoms, and $E A (O^{+}) > E A (S^{+})$ aligns with their ionization energies, while $E A (S) > E A (O)$ due to less electronic repulsion in sulfur.

Option B is incorrect: Smaller F⁻ ions undergo heavier hydration in water, creating a larger hydrated radius that lowers its mobility and electrical conductivity compared to I⁻.

Option C is correct: The ionic radius increases down the groups with the number of electron shells (Br⁻ has 4 shells, S²⁻ has 3 shells, and N³⁻ has 2 shells).

Option D is correct: Both Na⁺ and Mg²⁺ are isoelectronic ( $1 s^{2} 2 s^{2} 2 p^{6}$ ), but Mg²⁺ has a higher nuclear charge ( $Z = 12$ ), making its third ionization energy ( $I E_{3}$ ) greater than $I E_{2}$ of Na.

Chemistry - PERIODIC TABLE Question with Solution | TestHub

Options:(select one or more)

Doubts & Discussion