Which of the following series of isoelectronic ions (Mg²⁺, N³⁻, F⁻, Si⁴⁺) has the ionic radii in order of largest to smallest? A) Mg²⁺ > N³⁻ > F⁻ > Si⁴⁺ B) Mg²⁺ > Si⁴⁺ > F⁻ > N³⁻ C) N³⁻ > F⁻ > Si⁴⁺ > Mg²⁺ D) N³⁻ > F⁻ > Mg²⁺ > Si⁴⁺ E) F⁻ > N³⁻ > Si⁴⁺ > Mg²⁺

The correct arrangement of the isoelectronic ions  in order of largest to smallest ionic radii is; N³⁻ > F⁻ > Mg²⁺ > Si⁴⁺

Isoelectronic ions are ions that have the same number of electrons, All the ions listed have ten electrons.

We must know that ionic radius is a periodic trend that increases across the period.

The ionic radii of the ions are listed as follows;

Hence, the correct order of ionic radii from largest to smallest is N³⁻ > F⁻ > Mg²⁺ > Si⁴⁺.

Learn more; link

u i forgot the answer?