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Common Oxidation States

" Fe3+ is mo...

Question

" $F e^{3 +}$ is more stable than $F e^{2 +}$ ."
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Solution

In terms of electronic structure, $F e^{3 +}$ is more stable than $F e^{2 +}$ because it has a half filled d-orbital which gives extra stability. i.e.
$F e^{3 +} : [A r] 3 d^{5}$
$F e^{2 +} : [A r] 3 d^{6}$
Hence, $F e^{3 +}$ is more stable than $F e^{2 +}$ .

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