Hexafluoroferrate(III) ion is an outer orbital complex. The number of unpaired electrons present in it is:
Correct answer: B. 5
- A. 1
- B. 5
- C. 4
- D. Unpredictable
Explanation
In hexafluoroferrate(III), the iron is in the +3 oxidation state, giving it a d5 electron configuration. Since fluoride (F-) is a weak-field ligand, it forms a high-spin (outer orbital) complex. In this case, the five d-electrons remain unpaired in the d-orbitals.
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About Transition Elements
Transition elements are identified by their partially filled d subshells in atoms or common ions. The topic covers the electronic structure of d-block elements, including the filling order of 4s and 3d orbitals, variable oxidation states and the distinction between transition elements and elements with completely filled d subshells.
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