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Which one of the following ionic species has the greatest proton affinity to form

Which one of the following ionic species has the greatest proton affinity to form stable compound?

Options

(a) NH₂⁻
(b) F⁻
(c) I⁻
(d) HS⁻

Correct Answer:

NH₂⁻

Explanation:

Proton affinity decreases in moving across the period from left to right due to increase in charge, within a group the proton affinities decreases from top to bottom. Nitrogen family > Oxygen family > Halogens

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