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Stable oxidation states generally form compounds more easily than unstable oxidation states. This is because stable oxidation states correspond to electron configurations with filled or half-filled orbitals, which are energetically favorable. For example, the +2 oxidation state of iron (Fe²⁺) is more stable than the +3 oxidation state (Fe³⁺) because Fe²⁺ has a filled 3d orbital, while Fe³⁺ has a partially filled 3d orbital. Therefore, Fe²⁺ will form compounds more readily than Fe³⁺.