Question

Number of bridging CO ligands in $\left[M{n}_2{\left(CO\right)}_{10}\right]$ is __________ .

Answer 1

$\left[M{n}_2{\left(CO\right)}_{10}\right]$

The given compound obeys 18 $e^{-}$ rule,
$Mn\to 7Mn-Mnbond\to 1\text{5 terminal CO's}\to 10$
hence, the given structure is correct.
$\therefore$ No. of bridging CO ligands = 0