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Iron carbonyl, $Fe(CO)_5$ is
Explanation
One Fe atom per molecule means mononuclear.
Detailed Solution
Based on the number of metal atoms present in a complex, they are classified into mononuclear, dinuclear, trinuclear and so on.
e.g. $Fe(CO)_5$: mononuclear; $Co_2(CO)_8$: dinuclear; $Fe_3(CO)_{12}$: trinuclear
So $Fe(CO)_5$ is mononuclear.