AP EAMCET · Chemistry · Structure of Atom

If four elements with atomic numbers \(Z-2\), \(Z-1, Z\) and \(Z+1\) are forming isoelectronic ions, the atomic number of the ion having largest size is

A Z - 2
B Z - 1
C Z
D Z + 1

Verified Solution

Answer & Solution

Correct Answer

(A) Z - 2

Step-by-step Solution

Detailed explanation

\(\because\) ' \(Z\) ' represents number of protons in a nucleus. Therefore, for an isoelectronic species; size of anion \(>\) atom \(>\) cation. Means the species with more electrons w.r.t. protons in nucleus is of larger size [i.e. has smaller value of \(Z\) ]. Thus, \(Z-2\)…

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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