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प्रश्न
How would you account for the following:
Actinoid contraction is greater than lanthanoid contraction.
Actinoid contraction is greater from element to element than lanthanoid contraction. Why?
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उत्तर
In actinoids, 5 f-orbitals are filled. These 5 f-orbitals have a poorer shielding effect than 4 f-orbitals (in lanthanoids). Thus, the effective nuclear charge experienced by electrons in valence shells in the case of actinoids is much more than that experienced by electrons in valence shells in the case of lanthanoids. Hence, the size contraction in actinoids is greater than that in lanthanoids.
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संबंधित प्रश्न
Distinguish between lanthanoid and actinoids.
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 chemical reactivity.
How would you account the following :
Highest fluoride of Mn is MnF4 whereas the highest oxide is Mn2O7.
How do you prepare:
Actinoid elements show wide range of oxidation states.
Give reasons for the following:
The chemistry of actinoids elements is not so smooth as that of the lanthanoids.
Choose the most correct option.
In which of the following series all the elements are radioactive in nature?
Which of the following actinoids exhibits only + 3 oxidation state?
The number of unpaired f-electrons in ytterbium (Z = 70) is ____________.
The highest oxidation state in plutonium (At. no. = 94) is ______.
The inner transition metals of 5f series are known as ____________.
Maximum oxidation state exhibited by Chlorine is ______.
Which of the following oxidation state is common for all lanthanoids?
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.
What is actinoid contraction?
