Answer:
\[A{{g}_{47}}\to
4{{d}^{10}},5{{s}^{1}}\]
\[A{{g}^{+}}\to
4{{d}^{10}},5{{s}^{0}}\]
\[A{{g}^{2+}}\to
4{{d}^{9}},5{{s}^{0}}\]
Configuration shows that \[A{{g}^{+}}\]
is more stable than\[A{{g}^{2+}}\], thus \[A{{g}^{2+}}\] change to \[A{{g}^{+}}\]
and it acts as oxidising agent.
\[\underset{\begin{smallmatrix}
Less \\
stable
\end{smallmatrix}}{\mathop{A{{g}^{2+}}}}\,+{{e}^{-}}\to
\underset{\begin{smallmatrix}
More \\
stable
\end{smallmatrix}}{\mathop{A{{g}^{+}}}}\,\]
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