[tex]\begin{tabular}{|c|c|c|}
\hline atom & subshell from which electron removed to form [tex]+1[/tex] cation & subshell to which electron added to form [tex]-1[/tex] anion \\
\hline [tex]\mathrm{H}[/tex] & [tex]1 s[/tex] & [tex]1 s[/tex] \\
\hline [tex]\mathrm{Be}[/tex] & {[} & [tex]\square[/tex] \\
\hline [tex]\mathrm{Rb}[/tex] & [tex]\square[/tex] & [tex]\square[/tex] \\
\hline [tex]\mathrm{Xe}[/tex] & &
\end{tabular}[/tex]