What two oxidation states are more frequently observed in the first transition series than in the third?

Question

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The first transition series includes elements from Scandium (Sc) to Zinc (Zn), and the third transition series includes elements from Yttrium (Y) to Mercury (Hg). The two oxidation states that are more frequently observed in the first transition series than in the third are +2 and +3. This is because the first transition series elements have relatively stable electronic configurations with partially filled d-orbitals, making it easier for them to lose only 2 or 3 electrons to achieve a stable oxidation state. In contrast, the third transition series elements have a higher nuclear charge and more electrons to remove, making it more difficult for them to achieve these lower oxidation states.

What Two Oxidation States Are More Frequently Observed in the First