Multiple choice

The ground state term symbols of Fe3+ and Fe2+ in a high spin ligand system are __________.

  1. 6S5/2 and 5D4

  2. 6S3/2 and 5D3

  3. 5S5/2 and 5D4

  4. 6S3/2 and 4D3/2

  5. 6S5/2 and 5D3/2
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A Correct answer
Explanation

Fe3+ and Fe2+ have d5 and d6 electronic configurations and both are in high spin ligand system. The term symbol is calculated by the formula- 2s+1 LJ For d5, n = 5 s = n/2 = 5/2 2s + 1 = 6 L = 0 = S J = (L + s) to (L - s) = 5/2 Possible term symbol for Fe3+ = 2s + 1 LJ = 6S5/2 Similarly, possible term symbols for Fe2+ = 5D4, 5D3, 5D2, 5D1, 5D0 The ground state term for Fe3+ is 6S5/2. The ground state term for Fe2+ is 5D4.

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