Oxygen has 6 electrons in its outermost shell, with 4 of them being paired and 2 of them being unpaired. This can be represented in a dot diagram as follows:
\[
\begin{array}{c}
\text { Oxygen } \\
\text { . . } \\
\text { . O . } \\
\text { . . }
\end{array}
\]
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