Which of the following ions has the greatest number of unpaired electrons?
[tex][tex][tex]\begin{tabular}{|l|l|}
\hline & [tex]\mathrm{Sn}^{4+}[/tex] \\
\hline [tex]\mathrm{O}[/tex] & [tex]\mathrm{Mn}^{4+}[/tex] \\
\hline [tex]\mathrm{O}[/tex] & [tex]\mathrm{Y}^{3+}[/tex] \\
\hline [tex]\mathrm{O}[/tex] & [tex]\mathrm{Ag}^{+}[/tex] \\
\hline [tex]\mathrm{O}[/tex] & [tex]\mathrm{Cl}[/tex] \\
\hline
\end{tabular}[/tex][/tex][/tex]