Distinguish between lanthanoid and 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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Solution Distinguish Between Lanthanoid and Actinoids. Concept: F-block Elements - The Actinoids.