What is the EAN value of `W(CO)_(6)` carbonyl ompounds ?

Answer

To find the Effective Atomic Number (EAN) of the carbonyl compound \( W(CO)_6 \), we will follow these steps:

### Step 1: Identify the central metal ion and its atomic number.
The central metal ion in the compound \( W(CO)_6 \) is tungsten (W). The atomic number of tungsten is 74.

### Step 2: Determine the oxidation state of the central metal ion.
In this case, carbonyl (CO) is a neutral ligand, which means it does not contribute any charge. Therefore, the oxidation state of tungsten in this complex is 0.

### Step 3: Use the EAN formula.
The formula for calculating the EAN is:
\[ \text{EAN} = Z - C + (L \times 2) \]
Where:
- \( Z \) = Atomic number of the central metal ion
- \( C \) = Charge on the central metal ion
- \( L \) = Number of lone pair donating sites from the ligands

### Step 4: Substitute the values into the formula.
- \( Z = 74 \) (atomic number of tungsten)
- \( C = 0 \) (oxidation state of tungsten)
- \( L = 6 \) (since there are 6 carbonyl ligands, each contributing 1 lone pair)

Now substituting these values into the EAN formula:
\[ \text{EAN} = 74 - 0 + (6 \times 2) \]

### Step 5: Calculate the EAN.
Calculating the expression:
\[ \text{EAN} = 74 + 12 = 86 \]

### Conclusion:
The EAN value of the carbonyl compound \( W(CO)_6 \) is **86**.

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