The valence shell electronic configuration of alkali metals is

In $LiAlH_4$,metal $Al$ is present in

Give the biological importance of the sodium ion $(Na^+)$.

Assertion : $K$,$Rb$ and $Cs$ (all belonging to group $1$) can also form superoxides.
Reason : The ionic radii of $K$,$Rb$ and $Cs$ show the following trend $Cs^{+} < Rb^{+} < K^{+}$.

$A$ metal $M$ on heating in nitrogen gas gives $Y$. $Y$ on treatment with $H_2O$ gives a colourless gas which when passed through $CuSO_4$ solution gives a blue colour. $Y$ is

Which of the following reactions does not liberate a gaseous product?