Which element does not form a mononuclear car | vedclass

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(B) Mononuclear carbonyls contain only one metal atom per molecule.$Fe$ forms $Fe(CO)_5$,$Ni$ forms $Ni(CO)_4$,and $W$ forms $W(CO)_6$.$Mn$ forms a bi

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$Mn$

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(B) Mononuclear carbonyls contain only one metal atom per molecule.$Fe$ forms $Fe(CO)_5$,$Ni$ forms $Ni(CO)_4$,and $W$ forms $W(CO)_6$.$Mn$ forms a binuclear carbonyl,$Mn_2(CO)_{10}$,because it has an odd number of valence electrons ($7$ valence electrons),and it dimerizes to satisfy the $18$-electron rule.Therefore,$Mn$ does not form a stable mononuclear carbonyl.

Which element does not form a mononuclear carbonyl?

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