Assertion: Helium and berylium having similar outer electronic configuration of type ns2 . Reason: Both are chemically inert.

Question

Assertion: Helium and berylium having similar outer electronic configuration of type ns2 . Reason: Both are chemically inert. (A) If both Assertion and Reason are true and the Reason is a correct explanation of the Assertion (B) If both Assertion and Reason are true but Reason is not a correct explanation of the Assertion (C) If Assertion is true but the Reason is false (D) If both Assertion and Reason are false

Tardigrade Admin · Accepted Answer

Helium: Z=2 ; 1 s2 Berylium: Z =4 ; 1 s 2, 2 s 2 Helium is an inert gas while beryllium is reactive due to unfilled 2 p valence shells.

Q. Assertion: Helium and berylium having similar outer electronic configuration of type $n s^{2}$ .
Reason: Both are chemically inert.

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

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

If Assertion is true but the Reason is false

If both Assertion and Reason are false

Helium $: Z = 2; 1 s^{2}$

Berylium : $Z = 4; 1 s^{2}, 2 s^{2}$

Helium is an inert gas while beryllium is reactive due to unfilled $2 p$ valence shells.

Q. Assertion: Helium and berylium having similar outer electronic configuration of type ns2 . Reason: Both are chemically inert.