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If [Fe(CO)x] follows the Sidgwick rule ...

If `[Fe(CO)_x]` follows the Sidgwick rule of stability, what is the value of 'x'?

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The complex compound `[Fe(CO)_x]` following the Sidgwick rule of stability, EAN of iron is to be equal to the atomic number of nearst inert gas 36 (Krypton).
`36 = 26 - 0 + 2 xx x rArr x= 5`
Hence the value of x is 5.
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