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

In case of isoelectronic species the size of \(\mathrm{F}^{-}, \mathrm{Ne}\) and \(\mathrm{Na}^{+}\)is affected by _______.

A Principal quantum number \((n)\)
B None of the factors because their size is the same
C Electron-electron interaction in the outer orbitals
D Nuclear charge \((z)\)

Verified Solution

Answer & Solution

Correct Answer

(D) Nuclear charge \((z)\)

Step-by-step Solution

Detailed explanation

In \(\mathrm{F}^{-}, \mathrm{Ne}, \mathrm{Na}^{+}\)all have \(1 \mathrm{~s}^2, 2 \mathrm{~s}^2, 2 \mathrm{p}^0\) configuration. They have different size due to the difference in nuclear charge.

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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