Explain trivalent ion fe3+ ion os more stable than th divalent ion fe2+
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Half-filled and fully-filled orbitals are extra stable, because of their symmetry. Fe 3+ has d5 configuration, which is half filled. Fe 2+ has d6 configuration and neighter half filled nor full filled, partiall filled, which is less symmetric than d5 configuration. So Fe3+ ion are more stable than Fe2+.
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