The number of unpaired electrons in Fe3+ (Z = 26) are?
Correct answer: A. 5
- A. 5
- B. 6
- C. 3
- D. 4
Explanation
When Fe loses three electrons to form Fe3+, it loses its 4s2 and one 3d electron, leaving behind five unpaired electrons in the 3d 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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