\textbf{205-} Which statement about the periodic table of elements is correct?
\begin{enumerate}
\item The last element of each period in group 10 has a place.
\item Elements of groups 14 to 18 are called ordinary elements under normal conditions.
\item The last subshell of intermediate elements contains 2 electrons.
\item In elements of group 17, electronegativity and reactivity decrease with increasing atomic number.
\end{enumerate}