MHT CET · Chemistry · Classification of Elements and Periodicity in Properties

Which among the following elements has highest electronegativity?

A K
B Na
C Li
D Cs

Verified Solution

Answer & Solution

Correct Answer

(C) Li

Step-by-step Solution

Detailed explanation

The electronegativity of Group 1 elements decreases down the group. Hence, the decreasing order of electronegativity is \(\mathrm{Li}\gt\mathrm{Na}\gt\mathrm{K}\gt\mathrm{Cs}\).

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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