MEDIUMMCQ SINGLEIChO (Chemistry Olympiad)Inorganic ChemistryCoordination compoundsWerner’s Theory

Which of the following complex ions violates the EAN rule?

A.[Pt(NH3)6]4+

B.[Fe(CO)5]

C.[Fe(CN)6]4–

D.[Mn(H2O)6]2+✓ Correct

Explanation

The Sidgwick‘s effective atomic number (EAN) rule explains that an inert gas configuration is acquired by the central metal atom. According to this rule, a metal atom will accept electrons until the sum of the number of electrons present around the metal becomes equal with the atomic number of the next noble gas. Krypton has atomic number 36 and Radon has atomic number

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