I am unable to get the layout as shown also i am unable to get the ions in column 1. Na+ doesn't come the way it is required. Kindly help
This is what i wrote
\begin {tabular}{||c||c||c||}
\hline
\ Ion & SBF & HBP \\
\hline
Na^{+} & 142 & 142 \\
\hline
K^{+} & 5 & 5 \\
\hline
Mg^{2+} & 1.5 & 1.5 \\
\hline
\end{tabular}