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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.
Give a reason for the following:
Actinoids show irregularities in their electronic configurations.
With reference to structural variability and chemical reactivity, write the differences between lanthanoids and actinoids
Write one similarity and one difference between the chemistry of lanthanoid and actinoid elements.
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.
Manganese in the +2 oxidation state is more stable than +3 oxidation state where as iron is stable at +3 oxidation state than +2 oxidation state. Explain why?
Which of the following actinoids exhibits only + 3 oxidation state?
Identify the CORRECT statement.
Actinoid series begins at ____________ and ends at ____________.
The number of unpaired f-electrons in ytterbium (Z = 70) is ____________.
The electronic configuration of Ux+ ion is [Rn]. What is the value of x?
[At. No. of U = 92]
Which among the following elements is radioactive?
The inner transition metals of 5f series are known as ____________.
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.
The incorrect statement among the following is:
What causes actinoid contraction?
Why do actinoids show variable oxidation states?
What are actinoids? Give their general electronic configuration.
