HSC Science (General) 12th Board ExamMaharashtra State Board
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Distinguish Between Lanthanoid and Actinoids. - HSC Science (General) 12th Board Exam - Chemistry

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Question

Distinguish between lanthanoid and actinoids.

Solution

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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APPEARS IN

 2015-2016 (March) (with solutions)
Question 6.1 | 3.00 marks
 2014-2015 (October) (with solutions)
Question 6.2 | 2.00 marks
Solution Distinguish Between Lanthanoid and Actinoids. Concept: F-block Elements - The Actinoids.
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