Among $\mathrm{V}(\mathrm{CO})_{6}, \mathrm{Cr}(\mathrm{CO})_{5}, \mathrm{Cu}(\mathrm{CO})_{3}, \mat

Question

Among $\mathrm{V}(\mathrm{CO})_{6}, \mathrm{Cr}(\mathrm{CO})_{5}, \mathrm{Cu}(\mathrm{CO})_{3}, \mathrm{Mn}(\mathrm{CO})_{5}, \mathrm{Fe}(\mathrm{CO})_{5}$, $\left[\mathrm{Co}(\mathrm{CO})_{3}ight]^{3-},\left[\mathrm{Cr}(\mathrm{CO})_{4}ight]^{4-}$, and $\mathrm{Ir}(\mathrm{CO})_{3}$, the total number of species isoelectronic with $\mathrm{Ni}(\mathrm{CO})_{4}$ is $\_\_\_\ $.\ [Given, atomic number: $\mathrm{V}=23, \mathrm{Cr}=24, \mathrm{Mn}=25, \mathrm{Fe}$ $=26, \mathrm{Co}=27, \mathrm{Ni}=28, \mathrm{Cu}=29, \mathrm{Ir}=77]$\

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