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Question
Which is more stable? Fe3+ or Fe2+ – explain.
Solution
e (Z = 26)
\[\ce{Fe -> Fe^2+ + 2e^-}\]
\[\ce{Fe -> Fe^3+ + 3e^-}\]
Fe2+ [Number of electrons 24]
Electronic configuration = [Ar] 3d6
Fe3+ [Number of electrons 23]
Electronic configuration = [Ar] 3d5
Among Fe3+ and Fe2+, Fe3+ is more stable due to half-filled d-orbital. This can be explained by the Aufbau principle. Half filled and completely filled d-orbitals are more stable than partially filled d-orbitals. So Fe3+ is more stable than Fe2+.
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