Question

An element $A$ combines with oxygen to form an oxide $AO$. This oxide is electrically conducting. Find
(A) the number of valence electrons in $A$
(B) the group to which the element $A$ belongs
(C) the formula of the compound when $A$ reacts with chlorine

Answer 1

$AO$

$\underset{}{A^{2+}{O}^{2-}}$

electrically conducting

(a) No. of valance $e^{-}$ will be $2$ since $A$ belong to $2^{nd}$ group.

(b) Group $=2^{nd}$ group

(c) ${ACl}_2$