Write four points of distinction between Lanthanoids and 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+)` , PuO2+, UO+.
|7||4f 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.|
Concept: F-block Elements - The Lanthanoids
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