KCET · Chemistry · Chemical Kinetics

Among the elements from atomic number \( 1 \) to \( 36 \),the number of elements which have an
unpaired electron in their s-subshell is

A \( 7 \)
B \( 09 \)
C \( 04 \)
D \( 06 \)

Verified Solution

Answer & Solution

Correct Answer

(D) \( 06 \)

Step-by-step Solution

Detailed explanation

Between atomic number \( 1 \) to \( 36 \) only \( 3 \) alkali metals, hydrogen atom and \( 2 \) d-block elements (i.e., to make most stable
electronic configuration) appears which have an unpaired electron in their s-subshell. Therefore, total \( 6 \) elements, that is,
\( \mathrm{H}, \mathrm{Li}, \mathrm{Na}, \mathrm{K}, \mathrm{Cr} \) and \( \mathrm{Cu} \) between atomic number \( 1 \) to \( 36 \) appears.

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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Among the elements from atomic number \( 1 \) to \( 36 \),the number of elements which have anunpaired electron in their s-subshell is

Step-by-step Solution

Among the elements from atomic number \( 1 \) to \( 36 \),the number of elements which have an
unpaired electron in their s-subshell is