Answer
See table
Work Step by Step
We complete the given table:
\[
\begin{array}{|c|c|c|c|c|}
\hline
\textbf{Symbol} & \textbf{Protons} & \textbf{Neutrons} &\text{Electrons} & \text{ Net charge} \\ \hline
{}^{238}_{92}U & 92 & 146 & 92 &0 \\ \hline
{}^{40}_{20}Ca^{2+} & 20 & 20 &18 &2+ \\ \hline
{}^{51}_{23}V^{3+} & 23 & 28 & 20 & 3+ \\ \hline
{}^{89}_{39}Y & 39 & 50 & 39 &0 \\ \hline
{}^{79}_{35}Br & 35& 44 & 36 & 1- \\ \hline
{}^{31}_{15}P^{3-} & 15 & 16 & 18 &3- \\ \hline
\end{array}
\]
