Beryllium is diagonally related to the element \(X\) and lithium is diagonally related to the element \(Y\). The nature of oxides of \(X\) and \(Y\) are respectively
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Diagonal relationships:
\[
\boxed{
\mathrm{Li \leftrightarrow Mg}
}
\]
\[
\boxed{
\mathrm{Be \leftrightarrow Al}
}
\]
Also,
\[
\mathrm{Al_2O_3}
\text{ is amphoteric, while }
\mathrm{MgO}
\text{ is basic.}
\]