Which of the following coordination complexes | vedclass

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Question

(D) The $EAN$ (Effective Atomic Number) rule states that the total number of electrons around the central metal ion in a complex should equal the atom

Vedclass · Accepted Answer

$[Cu(NH_3)_4]^{2+}$

Vedclass · Answer

(D) The $EAN$ (Effective Atomic Number) rule states that the total number of electrons around the central metal ion in a complex should equal the atomic number of the next noble gas.For $[Pt(NH_3)_6]^{4+}$: $EAN = 78 - 4 + 6(2) = 86$ (matches Radon).For $[Fe(CN)_6]^{4-}$: $EAN = 26 - 2 + 6(2) = 36$ (matches Krypton).For $[Zn(NH_3)_4]^{2+}$: $EAN = 30 - 2 + 4(2) = 36$ (matches Krypton).For $[Cu(NH_3)_4]^{2+}$: $EAN = 29 - 2 + 4(2) = 35$ (does not match Krypton,$36$).Thus,$[Cu(NH_3)_4]^{2+}$ is an exception to the $EAN$ rule.

Which of the following coordination complexes is an exception to the $EAN$ rule? (Given atomic numbers: $Pt = 78, Fe = 26, Zn = 30, Cu = 29$)

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