Question
What is the difference between lanthanoids and actinoids?
✓
Answer
Difference between Lanthanoids and Actinoids:
| Lanthanoids | Actinoids |
| 1. Besides +3 oxidation state, they show +2 and +4 oxidation states only in few cases. | 1. Besides +3 oxidation state, they show higher oxidation states of +4 , $+5,+6$ and +7 also. |
| 2. Most of their ions are colourless. | 2. Most of their ions are coloured. |
| 3. They have less tendency towards complex forma-tion. | 3. They have greater ten-dency towards complex formation. |
| 4. Lanthanoid compounds are less basic. | 4. Actinoid compounds are more basic. |
| 5. Do not form oxocations. | 5. From oxocations e.g. $UO _2^{2+}, PuO _2^{2+}$ and $UO ^{+}$. |
| 6. Except promethium, they are non-radioactive. | 6. They are radioactive. |
| 7. Their magnetic properties can be explained easily. | 7. Their magnetic properties cannot be explained easily. |
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