The number of electrons in valence shell of ferrocene are:

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Solution

The correct option is C 18
Ferrocene : $F e (C_{5} H_{5})_{2}$
Counting the Number of Electrons:
Two conventions for counting the number of electrons in a complex
(a):
Oxidation state (Ionic model) of counting electrons:
$F e^{2 +} \to 6 e^{-} 2 C_{5} H_{5}^{-} \to 12 e^{-}$
Total $18 e^{-}$ are there.
(b): Neutral atom (Covalent model) of counting electrons:
$F e \to 8 e^{-} 2 C_{5} H_{5}^{∙} \to 10 e^{-}$
Total $18 e^{-}$ are there.

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