\textbf{206-} If in the structure of the dichromate ion, around each atom, 8 electrons exist, how many pairs of bonding electrons are there? How many covalent bonds does one oxygen atom in it have?
\medskip
(1) $2$ \hfill (2) $2.5$ \hfill (3) $3$ \hfill (4) $3.5$
%% Page 38
\textbf{Chemistry \hfill 120-C \hfill Page 20}
\medskip