be subshell from which electron removed to form +1 cation
[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 -1 anion \\
\hline H & [tex]1 s[/tex] & [tex]1 s[/tex] \\
\hline [tex]\mathrm{Y}[/tex] & [tex]\square[/tex] & [tex]\square[/tex] \\
\hline [tex]\mathrm{Ga}[/tex] & [tex]\square[/tex] & [tex]\square[/tex] \\
\hline [tex]\mathrm{Ca}[/tex] & [tex]\square[/tex] & [tex]\square[/tex] \\
\hline
\end{tabular}[/tex]