205- If the number of electrons in sublayer $4s$ of atom A is twice the number of electrons in the sublayer below $3d$ of atom B, and the number of electrons in this sublayer in atom A is half the number of electrons in this sublayer in atom B, which two elements are in period four of the periodic table, from right to left respectively?
[(1)] $_{29}\text{Cu},\ _{24}\text{Cr}$
[(2)] $_{29}\text{Cu},\ _{25}\text{Mn}$
[(3)] $_{30}\text{Zn},\ _{24}\text{Cr}$
[(4)] $_{30}\text{Zn},\ _{25}\text{Mn}$
\textbf{205-} If the number of electrons in sublayer $4s$ of atom A is twice the number of electrons in the sublayer below $3d$ of atom B, and the number of electrons in this sublayer in atom A is half the number of electrons in this sublayer in atom B, which two elements are in period four of the periodic table, from right to left respectively?
\begin{enumerate}
\item[(1)] $_{29}\text{Cu},\ _{24}\text{Cr}$
\item[(2)] $_{29}\text{Cu},\ _{25}\text{Mn}$
\item[(3)] $_{30}\text{Zn},\ _{24}\text{Cr}$
\item[(4)] $_{30}\text{Zn},\ _{25}\text{Mn}$
\end{enumerate}