Answer
\begin{matrix}
Symbol & Ion & Electrons & Protons \\
F & F^{-} & 10 & 9\\
Be & Be^{2+} & 2 & 4\\
Br & Br^{-} & 36 & 35\\
Al & Al^{3+} & 10 & 13 \\
O & O^{2-} & 10 & 8
\end{matrix}
Work Step by Step
Ion commonly formed: Figure 4.14. page 110
Number of protons: Any periodic table, like figure 4.13, page 106.
Number of electrons = Number of protons - (ion charge)
