204- Which statement about the third-period elements of the periodic table is correct?
The magnitude of the first ionization energy is stable in three groups of them as: $1A > 3A > 2A$.
As the atomic number increases, the shielding effect of inner electron layers and the effective nuclear charge on them increases.
Among them, two metalloid elements exist whose valence shell contains 4 and 5 electrons respectively.
The first ionization energy of them from their own group in period 2 is lower, and the most electronegative of them is $S_{16}$.
\textbf{204-} Which statement about the third-period elements of the periodic table is correct?
\begin{enumerate}
\item The magnitude of the first ionization energy is stable in three groups of them as: $1A > 3A > 2A$.
\item As the atomic number increases, the shielding effect of inner electron layers and the effective nuclear charge on them increases.
\item Among them, two metalloid elements exist whose valence shell contains 4 and 5 electrons respectively.
\item The first ionization energy of them from their own group in period 2 is lower, and the most electronegative of them is $S_{16}$.
\end{enumerate}
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