TS EAMCET · Chemistry · Classification of Elements and Periodicity in Properties

Identify the pair of elements in which the difference in atomic radii is maximum

A \(\mathrm{C}, \mathrm{N}\)
B \(\mathrm{P}, \mathrm{S}\)
C \(\mathrm{O}, \mathrm{F}\)
D \(\mathrm{Li}, \mathrm{Be}\)

Verified Solution

Answer & Solution

Correct Answer

(D) \(\mathrm{Li}, \mathrm{Be}\)

Step-by-step Solution

Detailed explanation

1- C and N both element are in same period carbon has atomic radius approximately 70 pm . While nitrogen has 65 pm . So the difference is \((70-65)=5 \mathrm{pm}\) ) 2- O and F are in the same period oxygen atomic radius is 60 pm . Fluorine has atomic radius approximately 50 pm…

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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