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JEE Mains · Chemistry · STD 11 - 3. Classification of elements and periodicity in properties

\(N^{3-} , Na^+ ,F^- , Mg^{2+}\) and \(O^{2-}\) ની આયનીય કદ નો સાચો ક્રમ કયો છે ?

A \(Mg^{2+} > Na^+ > F^- > O^{2-} < N^{3-}\)
B \(N^{3-} < F^- > O^{2-} > Na^+ > Mg^{2+}\)
C \(Mg^{2+} < Na^+ < F^- < O^{2-} < N^{3-}\)
D \(N^{3-} > O^{2-} > F^- > Na^+ < Mg^{2+}\)

Verified Solution

Answer & Solution

Correct Answer

(C) \(Mg^{2+} < Na^+ < F^- < O^{2-} < N^{3-}\)

Step-by-step Solution

Detailed explanation

Ionic size increases with the addition of electrons and ionic size decreases with the loss of electrons. The nitride ion, has \(10\) electrons in contrast to only \(7\) protons. It has high inter electronic repulsions due to which it has the maximum size. The increasing order of…

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

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