\textbf{201-} A scientist named .............. by calculating the positive charge of atomic nuclei and dividing them by the electrical charge .............. obtained the correct numbers and called them .............. of the elements.
\begin{enumerate}
\item[(1)] Moseley -- atomic number
\item[(2)] Rutherford -- proton -- atomic number
\item[(3)] Rutherford -- proton -- relative atomic mass
\item[(4)] Moseley -- electron -- relative nuclear mass
\end{enumerate}