Question:
Which of the following statements regarding actinoids is correct?
Which of the following statements regarding actinoids is correct?
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Actinoids:
• Highly radioactive
• Variable oxidation states
• Strong complex formation tendency
• Highly radioactive
• Variable oxidation states
• Strong complex formation tendency
Updated On: Jun 8, 2026
- All actinoids show only +3 oxidation state
- Actinoids exhibit a wider range of oxidation states than lanthanoids
- Actinoids are less radioactive than lanthanoids
- Actinoids do not form complexes
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The Correct Option is B
Solution and Explanation
Concept:
Actinoids belong to the 5f-block of the periodic table. Due to the small energy difference between 5f, 6d and 7s orbitals, they exhibit multiple oxidation states.
This is one of the most important NCERT facts.
Step 1: Understand oxidation states.
Common oxidation states of actinoids are: \[ +3,+4,+5,+6,+7 \] Examples: \[ U^{3+}, U^{4+}, U^{5+}, U^{6+} \]
Step 2: Compare with lanthanoids.
Lanthanoids mainly show: \[ +3 \] oxidation state. Hence actinoids display greater variability.
Step 3: Analyze options.
Only statement (B) is correct. Therefore: \[ \boxed{\text{Actinoids exhibit a wider range of oxidation states}} \]
Step 1: Understand oxidation states.
Common oxidation states of actinoids are: \[ +3,+4,+5,+6,+7 \] Examples: \[ U^{3+}, U^{4+}, U^{5+}, U^{6+} \]
Step 2: Compare with lanthanoids.
Lanthanoids mainly show: \[ +3 \] oxidation state. Hence actinoids display greater variability.
Step 3: Analyze options.
Only statement (B) is correct. Therefore: \[ \boxed{\text{Actinoids exhibit a wider range of oxidation states}} \]
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