Write two similarities and two differences between lanthanoids and actinoids.
Q.10
Write two similarities and two differences between lanthanoids and actinoids.
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Answer:
Similarities:
- Both show a predominant oxidation state of +3.
- Both involve filling of f-orbitals (4f for lanthanoids, 5f for actinoids) and both show a contraction in size across the series (lanthanoid and actinoid contraction). (Also: both are electropositive, reactive metals.)
Differences:
| Lanthanoids | Actinoids |
|---|---|
| 4f orbitals are filled. | 5f orbitals are filled. |
| Show limited oxidation states (mainly +3, sometimes +2, +4). | Show a wide range of oxidation states (+3 to +7). |
| Except promethium, they are non-radioactive. | All are radioactive. |
| Less tendency to form complexes. | Greater tendency to form complexes. |
Doubtly AI
· 27 Oct 2026
AI-verified · Oct 2026
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