\textbf{205-} If the electronic configuration ends with $1s^2$, which of the following statements about it is correct?
\begin{itemize}
\item The related element is only in the first period of the periodic table.
\item The related element can be placed in the first group of the periodic table.
\item Such an element can be connected to the anion of alkaline earth metals.
\item The related element can have the highest ionization energy among elements.
\end{itemize}
\begin{center}
(1) 1 \qquad (2) 2 \qquad (3) 3 \qquad (4) 4
\end{center}
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