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Which one of the following elements shows maximum number of different oxidation states in its compounds?

1. Eu
2. La
3. Ge
4. Am

Correct answer: Am

Solution

Americium (Am) belongs to the actinide series and exhibits a wide range of oxidation states, from +2 to +7, due to the involvement of 5f, 6d, and 7s orbitals in bonding. The other elements have more limited oxidation states.

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