What is the calculated Effective Atomic Number (EAN) of the vanadium atom in the stable hexacarbonyl — Coordination Compounds Chemistry Question

💡 Solution & Explanation

The complex is $[V(CO)_6]^-$. The oxidation state of Vanadium is $-1$. Atomic number of $V = 23$. Formula: $EAN = Z - \text{O.S.} + 2(\text{C.N.})$ $EAN = 23 - (-1) + 2(6) = 23 + 1 + 12 = 36$. The anion achieves the noble gas configuration of Krypton (36).