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  4. Assertion: Helium is placed in group 18 along with p-block elements. Reason: It shows properties similar to p-block elements.

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Q. Assertion : Helium is placed in group $18$ along with $p$-block elements.
Reason: It shows properties similar to $p$-block elements.

Classification of Elements and Periodicity in Properties

Solution:

$He \left(1 s^{2}\right)$ should be placed along with $s$-block elements because of its electronic configuration but it has a completely filled valence shell and as a result it exhibits properties of noble gases, thus it is placed along with noble gases $\left(n s^{2}, n p^{6}\right)$