Question
Distinguish between Lanthanoides and Actinoides.
✓
Answer
| Lanthanoids | Actinoids |
| Differentiating electron enters 4f orbitals | Differentiating electron enters 5f orbitals |
| Belong to the sixth period and form part of the third transition series. They constitute the first inner transition series. | Belong to the seventh period and form part of the fourth transition series. They constitute the second inner transition series. |
| Binding energy of 4f orbitals is higher. | Binding energy of 5f orbitals is lower. |
| Besides the +3 oxidation state, lanthanoids show +2 and + 4 oxidation states in few cases. | Besides the +3 oxidation state, actinoids show higher oxidation states such as +4, +5 and +7. |
| They show lesser tendency to form complexes. | They show greater tendency to form complexes. |
| Some of the lanthanoids are fairly coloured. | Most of the ions of actinoids are deeply coloured. Examples: U3+ (red), U4+ (green) |
| Only promethium is radioactive. | All the members of this series are radioactive. |
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