Assertion (A): Outermost electronic configuration of electropositive elements is ${\text{ns}}^1$.

Reason (R): ${\text{ns}}^1$ configuration is stable due to half filled sub shell’s

Assertion: It is a fact that Outermost electronic configuration of electropositive elements is ${\text{ns}}^1$.

Reason: R is incorrect-${\text{ns}}^1$ configuration is stable due to half filled sub shell’s. ${\text{ns}}^1$ is not stable i.e., it is highly E.P.