An element \( X \) has following electronic configuration \begin{tabular}{|c|c|c|} \hline K & ...

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An element \( X \) has following electronic configuration
\begin{tabular}{|c|c|c|}
\hline K & L & M \\
\hline 2 & 8 & 6 \\
\hline
\end{tabular}
To which period of the periodic table does element \( \mathrm{X} \) belong?
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