\textbf{205.} Hydrogen sulfate and hydrogen phosphate ions are similar in which respect?
$$(H = 1,\ O = 16,\ P = 31,\ S = 32 : \text{g.mol}^{-1})$$
\begin{enumerate}
\item Percentage of oxygen \hfill (2) Number of negative electric charge units
\item Number of central atom oxidation \hfill (4) Number of central atom electron pairs
\end{enumerate}