Question:
Find EAN of Fe in \(\text{Fe(CO)}_5\)
Find EAN of Fe in \(\text{Fe(CO)}_5\)
Show Hint
EAN = atomic number - oxidation state + 2 x coordination number.
Updated On: Oct 1, 2026
- \(35\)
- \(36\)
- \(26\)
- \(30\)
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The Correct Option is B
Solution and Explanation
Step 1: Understanding the Concept:
The effective atomic number (EAN) is the total number of electrons around the metal, counting those donated by ligands. \(\text{EAN} = Z - \text{ox. state} + 2 \times \text{(number of ligands, for neutral donors)}\).
Step 2: Key Formula or Approach:
In \(\text{Fe(CO)}_5\), CO is a neutral ligand, so Fe is in the \(0\) oxidation state. Fe has \(Z = 26\) and there are \(5\) CO ligands, each giving \(2\) electrons.
Step 3: Detailed Explanation:
\[ \text{EAN} = 26 - 0 + 5 \times 2 = 36 \]
This equals the atomic number of krypton, so the complex follows the EAN rule. The value \(26\) would be the bare atom, \(30\) would need only 2 ligands, and \(35\) is not a noble gas number.
Final Answer:
The EAN of Fe is \(36\), option (B). \[ \boxed{36} \]
The effective atomic number (EAN) is the total number of electrons around the metal, counting those donated by ligands. \(\text{EAN} = Z - \text{ox. state} + 2 \times \text{(number of ligands, for neutral donors)}\).
Step 2: Key Formula or Approach:
In \(\text{Fe(CO)}_5\), CO is a neutral ligand, so Fe is in the \(0\) oxidation state. Fe has \(Z = 26\) and there are \(5\) CO ligands, each giving \(2\) electrons.
Step 3: Detailed Explanation:
\[ \text{EAN} = 26 - 0 + 5 \times 2 = 36 \]
This equals the atomic number of krypton, so the complex follows the EAN rule. The value \(26\) would be the bare atom, \(30\) would need only 2 ligands, and \(35\) is not a noble gas number.
Final Answer:
The EAN of Fe is \(36\), option (B). \[ \boxed{36} \]
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