should be an inner orbital complex. Ignoring the pairing energy, the value of crystal field stabilization energy for this complex is .

Question

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Strategy:
 Inner orbital implies a low-spin configuration. Calculate the exact CFSE for this state based on  occupancy.

Step 1: Identify configuration
For , Iron is  ().
As an inner orbital (low-spin) complex driven by the strong  field, all 5 electrons occupy the lower  orbitals.
Arrangement: .

Step 2: Calculate CFSE

CFSE = .
Ignoring the pairing energy term, the value is .
The prompt asks for the value in the format , so the numerical value is 2.

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