Question:
Explain effective atomic number (EAN) by an example.
Explain effective atomic number (EAN) by an example.
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EAN helps in predicting the stability of metal complexes. If EAN matches the nearest noble gas configuration, the complex is stable.
Updated On: Mar 5, 2025
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Solution and Explanation
Step 1: Definition of Effective Atomic Number (EAN)
Effective Atomic Number (EAN) is the total number of electrons present around the central metal ion, including the electrons donated by ligands.
\[
EAN = Z - O + 2C
\]
where:
- \( Z \) = Atomic number of metal
- \( O \) = Oxidation state of metal
- \( C \) = Number of ligands coordinated
- \( Z \) = Atomic number of metal
- \( O \) = Oxidation state of metal
- \( C \) = Number of ligands coordinated
Step 2: Example - Fe in \([Fe(CN)_6]^{3-}\)
For Fe in \([Fe(CN)_6]^{3-}\): \[ Z = 26, \quad O = +3, \quad C = 6 \] \[ EAN = 26 - 3 + 2(6) = 35 \]Was this answer helpful?
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