Two metals \(A\) and \(B\) having similar ionic radii, react with oxygen to give only monoxides and react…
Two metals \(A\) and \(B\) having similar ionic radii, react with oxygen to give only monoxides and react with nitrogen to give nitrides. Then, \(A\) and \(B\) respectively are
\(\mathrm{L}\) and \(\mathrm{Na}\)
\(\mathrm{Na}\) and \(\mathrm{Ca}\)
\(\mathrm{Li}\) and \(\mathrm{Mg}\)
\(\mathrm{Na}\) and \(\mathrm{Be}\)
Solution
\(\mathrm{Li}^{+}\)among group- 1 metals and \(\mathrm{Mg}^{2+}\) of group- 2 metals have similar ionic radii, because they are diagonally present in the periodic table. The stable monoxides (only) of \(\mathrm{Li}\) and \(\mathrm{Mg}\) are \(\mathrm{Li}_2 \mathrm{O}\) and \(\mathrm{MgO}\) respectively.