Question

Considering their electrons affinities, it is possible for alkali metals to form an anion like M${}^{-}$ where M represents an alkali metal. If true enter 1, else enter 0.

Answer 1

$M\left(g\right)+e^{-}\to M^{-}\left(g\right)\Delta H=-ve$
$n{s}^1$ $n{s}^2$
$\uparrow$ $\uparrow \downarrow$
Since M${}^{-}$(g) has paired ns-electrons it is possible for alkali metals to form an anion lime M where M represents an alkali metal