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Which of the following elements exhibits the greatest variety of oxidation states in its compounds?

1. Eu
2. Ld
3. Gd
4. Am

Correct answer: Am

Solution

Americium (Am) is an actinide and shows a wide range of oxidation states (+2, +3, +4, +5, +6), far more than the lanthanides Eu (+2,+3) or Gd (+3). The listed option 'Ld' is not a real element, so Am is the answer.

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