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

Question

Assertion: Helium is placed in group 18 along with p-block elements. Reason: It shows properties similar to p-block elements. (A) If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion. (B) If both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion. (C) If the Assertion is correct but Reason is incorrect. (D) If the Assertion is incorrect and Reason is correct.

Tardigrade Admin · Accepted Answer

He (1 s2) 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 (n s2, n p6)

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

If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.

If both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion.

If the Assertion is correct but Reason is incorrect.

If the Assertion is incorrect and Reason is correct.

$He (1 s^{2})$ 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 $(n s^{2}, n p^{6})$

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