Among V(CO) _6, Cr(CO) _5, Cu(CO) _3, Mn(CO) _5, Fe(CO) _5, [ Co(CO) _3]^ 3- , [ Cr(CO) _4]^ 4- , and Ir(CO)...

Question

Among V(CO) _6, Cr(CO) _5, Cu(CO) _3, Mn(CO) _5, Fe(CO) _5, [ Co(CO) _3]^ 3- , [ Cr(CO) _4]^ 4- , and Ir(CO) _3, the total number of species isoelectronic with Ni(CO) _4 is _____. [Given, atomic number: V = 23, Cr = 24, Mn = 25, Fe = 26, Co = 27, Ni = 28, Cu = 29, Ir = 77]

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