Question
Write four points of distinction between Lanthanoids and Actinoids.
| Lanthanoids | Actinoids | |
| 1 | In lanthanoids, last differentiating electron occupies 4f orbital. | In actinoids, last differentiating electron occupies 5f orbital. |
| 2 | They are the elements of first inner transition series. | They are the elements of second inner transition series |
| 3 | They are present in period 6 . | They are present in period 7 . |
| 4 | Most of lanthanoids (with exception of promethium) occur in nature. | Most of actinoids (with exception of uranium and thorium) are prepared in laboratory |
| 5 | Most of lanthanoids (with exception of promethium) are non-radioactive. | All the actinoids are radioactive. |
| 6 | Lanthanoids do not form oxo cation. | Actinoids form oxo cation such as 22 UO_(2)^(2+),PuO^(2+),UO^(+). |
| 7 | 4 f orbitals in lanthanoids have higher binding energy. | 5f orbitals in actinoids have lower binding energy. |
| 8 | Contraction in atomic and ionic radii is relatively less in lanthanoids. | Contraction in atomic and ionic radii is relatively greater in actinoids due to poor shielding of 5f electrons. |
| 9 | Lanthanoids show +2,+3 and +4 oxidation states. | Actinoids show +3,+4,+5,+6,+7 oxidation states. |
| 10 | Lanthanoids have less tendency to form complexes. | Actinoids have greater tendency to form complexes. |
| 11 | Some ions of lanthanoids are coloured. | Most of the ions of actinoids are deeply coloured. |
| 12 | Lanthanoid hydroxides are less basic in nature. | Actinoid hydroxides are more basic in nature. |
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