Among the following species, which central metal atom/ion exhibits the maximum Effective Atomic Numb — Coordination Compounds Chemistry Question
Question
Among the following species, which central metal atom/ion exhibits the maximum Effective Atomic Number (EAN)? (Atomic numbers: Cr=24, Co=27, Fe=26, Ni=28)
Answer: B
💡 Solution & Explanation
Let's calculate the EAN for each: (A) $[Cr(EDTA)]^-$: Cr is +3. EDTA is hexadentate. $EAN = 24 - 3 + 12 = 33$. (B) $[Co(en)_3]^{3+}$: Co is +3. 'en' is bidentate. $EAN = 27 - 3 + 3(4) = 36$. (C) $[Fe(C_2O_4)_3]^{3-}$: Fe is +3. Oxalate is bidentate. $EAN = 26 - 3 + 12 = 35$. (D) $[Ni(CN)_4]^{2-}$: Ni is +2. Cyanide is monodentate. $EAN = 28 - 2 + 8 = 34$. The maximum EAN is 36, found in option B.
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