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Questions
How would you account for the following:
The chemistry of actinoids is more complicated as compared to lanthanoids.
Chemistry of actinoids is complicated as compared to lanthanoids. Give two reasons.
Why is the chemistry of actinoids complicated as compared to lanthanoids?
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Solution 1
The energy difference between the 6d, 7s and 5f orbitals is very small in actinoids. In addition, the 5f orbitals of the actinoids are less shielded than the 4f orbitals of the lanthanoids. Thus, in the lanthanoids, only 4f electrons of Ce participate in chemical bonding, whereas in the lighter actinoids, up to americium, the 5f electrons also take part. This makes the chemistry of actinoids more complicated than that of lanthanoids
Solution 2
The reasons are as follows:
- Actinoids display a large number of oxidation states, while lanthanoids primarily show only three oxidation states.
- Actinoids are radioactive in nature.
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RELATED QUESTIONS
Why do actinoids show a wide range of oxidation states?
With reference to structural variability and chemical reactivity, write the differences between lanthanoids and actinoids
Compare the chemistry of the actinoids with that of lanthanoids with reference to oxidation states
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How would you account the following :
Highest fluoride of Mn is MnF4 whereas the highest oxide is Mn2O7.
Which of the following actinoids exhibits only + 3 oxidation state?
Maximum oxidation state exhibited by Chlorine is ______.
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(i) Am
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Assertion: Actinoids form relatively less stable complexes as compared to lanthanoids.
Reason: Actinoids can utilise their 5f orbitals along with 6d orbitals in bonding but lanthanoids do not use their 4f orbital for bonding.
