Ean Rule

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The effective atomic number (EAN) of Fe in [Fe(CN)₆]⁴⁻ is:

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The **Effective Atomic Number (EAN)** is calculated as:
$EAN = Z - (Oxidation \, State) + 2 	imes (Coordination \, Number)$
For Fe in $[Fe(CN)_6]^{4-}$:
- **Atomic Number ($Z$)** of Fe $= 26$.
- **Oxidation State**: $x + 6(-1) = -4 \implies x = +2$.
- **Coordination Number**: 6 (monodentate $CN^-$ ligands).
$EAN = 26 - 2 + (2 	imes 6) = 24 + 12 = 36$
- 36 is the atomic number of Krypton ($Kr$). The complex follows the noble gas rule and is very stable.

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