Effective atomic number of $F e$ in $F e_{2} (C O)_{9}$ is___________.

35

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36

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37

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cannot be calculated

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Solution

The correct option is B $35$
Effective Atomic Number $=$ Atomic number of central atom $-$ (oxidation no. of central atom) $+$ No. of electron taken from Lingands.
Atomic No. of $F e = 26$ and $^{'} C O^{'}$ is a neutral lingand. So oxidation no. of central atom $= 0$ . The $3$ terminal bonds for each $^{'} F e^{'}$ share $2$ electrons each while the middle common bonds share $1$ electron.
Refer the above image.
Total shared electrons $= 3 \times 2 + 3 = 9$
Now, $E A N = 26 - 0 + 9 = 35$

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