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Question
Compare the chemistry of the actinoids with that of lanthanoids with reference to chemical reactivity.
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Solution
Chemical reactivity - In the lanthanide series, the earlier members of the series are more reactive. They have reactivity that is comparable to Ca. With an increase in the atomic number, the lanthanides start behaving similar to Al. Actinoids, on the other hand, are highly reactive metals, especially when they are finely divided. When they are added to boiling water, they give a mixture of oxide and hydride. Actinoids combine with most of the non-metals at moderate temperatures. Alkalies have no action on these actinoids. In case of acids, they are slightly affected by nitric acid (because of the formation of a protective oxide layer).
RELATED QUESTIONS
Distinguish between lanthanoid and actinoids.
How would you account for the following:
Actinoid contraction is greater than lanthanoid contraction.
Why do actinoids show a wide range of oxidation states?
Write on similarity between the chemistry of lanthanoids and actinoids.
With reference to structural variability and chemical reactivity, write the differences between lanthanoids and actinoids
Which is the last element in the series of the actinoids? Write the electronic configuration of this element. Comment on the possible oxidation state of this element.
Compare the chemistry of the actinoids with that of lanthanoids with reference to electronic configuration
Write one similarity and one difference between the chemistry of lanthanoid and actinoid elements.
What is the position of actinoids in periodic table ?
Which of the following actinoids shows +6 oxidation state?
Actinoid series begins at ____________ and ends at ____________.
Which among the following actinoids exhibits highest oxidation state +7?
The inner transition metals of 5f series are known as ____________.
There are 14 elements in actinoid series. Which of the following elements does not belong to this series?
Which of the following actinoids show oxidation states upto +7?
(i) Am
(ii) Pu
(iii) U
(iv) Np
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.
Why do actinoids show variable oxidation states?
