Which of the following complexes does NOT obey Sidgwick's Effective Atomic Number (EAN) rule? — Coordination Compounds Chemistry Question
Question
Which of the following complexes does NOT obey Sidgwick's Effective Atomic Number (EAN) rule?
Answer: B
💡 Solution & Explanation
In $[Fe(CN)_6]^{3-}$, Fe is $+3$. $EAN = 26 - 3 + 2(6) = 35$, which does not equal the atomic number of Kr (36). The others all yield an EAN of 36.
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