(C) The $EAN$ (Effective Atomic Number) is calculated using the formula: $EAN = Z - ON + 2 \times CN$,where $Z$ is the atomic number,$ON$ is the oxida

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(C) The $EAN$ (Effective Atomic Number) is calculated using the formula: $EAN = Z - ON + 2 \times CN$,where $Z$ is the atomic number,$ON$ is the oxidation number,and $CN$ is the coordination number. For $[Zn(NH_3)_4]^{2+}$: $Z$ of $Zn = 30$. $ON$ of $Zn$: $x + 4(0) = +2 \implies x = +2$. $CN$ of $Zn = 4$. $EAN = 30 - 2 + 2(4) = 28 + 8 = 36$.