Identify the central metal ions/atoms from the list below that possess an Effective Atomic Number (E — Coordination Compounds Chemistry Question

💡 Solution & Explanation

(A) $Fe$ in $[Fe(CN)_6]^{4-}$: Fe is +2. $EAN = 26 - 2 + 12 = 36$. (True) (B) $Co$ in $[Co(NH_3)_6]^{3+}$: Co is +3. $EAN = 27 - 3 + 12 = 36$. (True) (C) $V$ in $[V(CO)_6]^-$: V is -1. $EAN = 23 - (-1) + 12 = 36$. (True) (D) $Fe$ in $[Fe(CN)_6]^{3-}$: Fe is +3. $EAN = 26 - 3 + 12 = 35$. (False)