Question

The element expected to form the largest ion to achieve the nearest noble gas configuration is:

Options

• F

• N

• Na

• O

Answer 1

N

Explanation:

Let us write the electronic configuration for all the ions of the given atoms.

F⁻¹, N⁻³, Na⁺ and O⁻²

All ions are isoelectronic, containing 10 e⁻.

Z^eff - Na⁺ > F⁻ > O⁻² > N⁻³

Order of radius > N⁻³ > O⁻² > N⁻³

Nitrogen, to achieve noble gas configuration it gain 3 e⁻, and form N⁻³.