Name an element from Group $2$ which forms an amphoteric oxide and a water soluble sulphate.

(BERYLLIUM) Beryllium $(Be)$ is the element from Group $2$ that forms an amphoteric oxide,$BeO$,and a water-soluble sulphate,$BeSO_{4}$.
$BeO$ reacts with both acids and bases:
$BeO + 2HCl \rightarrow BeCl_{2} + H_{2}O$
$BeO + 2NaOH + H_{2}O \rightarrow Na_{2}[Be(OH)_{4}]$
$BeSO_{4}$ is soluble in water because its high hydration energy compensates for its lattice energy.