Chemistry S and P - Block Elements (S - Block Elements Not In Syllabus ) Electronic Configuration and Physical Properties of Alkali Metals Single Correct MCQ
Published on: August 12, 2026

Which of the following configurations represents the s–block element ?

A
[Ar]3d 10 4s 1
B
[Ne]3s 2 3p 1
C
[He] 2s 2 2p 6 3s 1
D
None of these

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The correct answer is:
C

The block of an element depends on the type of sub-shell which receives the last electron. As last electron enters in s-subshell of outer most shell according to Aufbau rule, the element of option belongs to s-block.

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