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How will you account for the following ?...

How will you account for the following ?
(i) The metallic radii of the third (5d) series of transition metals are virtually the same as those of the corresponding group members of the second (4d) series.
(ii) Lanthanoids form primarily +3 ions while actinoids usually have higher oxidation states in their compounds .
Among the lanthanoids, Ln(III) compounds are predominant. However, occasionally in solution or in solid state +2 and +4 ions are obtained. Explain.

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Among lanthanoids, Ln (III) compounds are predominant. However, occasionally in solutions or in solid compounds, +2 and +4 ions are also obtained.

The atomic radii of the metals of the third (5d) series of transitions elements are virtually the same as those of the corresponding members of the second (4d) series. Explain.

" The metallic radii of "4d" and "5d" series of transition metals are nearly the same.Why? "

How would you account for the following? (i) The atomic radii of the metals of the third (5d) series of transition elements are virtually the same as those of the corresponding member of the second (4d) serie (ii) Because oxygen and fluorine are highly electronegative elements and small in size.

How would you account for the following : (i) Many of the transition elements are virtually the same as those of the corresponding members of the second series. (iii) There is a greater range of oxidation states among the actinoids than among the lanthanoids.

DINESH PUBLICATION-D-AND -F BLOCK ELEMENTS-f-block element
  1. Give three important uses of lanthanoids and actinoids.

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  2. What is lanthanoid contraction? What is its cause and what ar its cons...

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  3. Why is the seperation of lanthanoids difficult ?

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  4. The element cerium forms Ce^(4+) ion in aqueous solution. Explain.

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  5. Which is the most common oxidation state exhibited by lanthanoids ?

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  6. What is lanthanoid contraction?

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  7. Why do Zr and Hf exhibit similar properties ?

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  8. (a) Why is La(OH)(3) is more basic than Lu(OH)(3) ? (b) Why ar the p...

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  9. What is meant by lanthanoids contraction ? What effect does it have o...

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  10. Whys is chemistry of all lanthaoids identical ?

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  11. Compare lanthanoids and actinoids with reference to : (i) the electr...

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  12. The actinoids exhibit, more member of oxidation states in general than...

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  13. How will you account for the following ? (i) The metallic radii of ...

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  14. Give details of Actinoids

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  15. What is Lanthanoid contraction? Name an alloy which contains some of t...

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  16. Name a member of the lanthanoid series which is well known to exhibit ...

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  17. Explain actinoid contraction .

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  18. Why do actinoid exhibit irregularity in their electronic configuration...

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  19. The chemistry of the early actinoids is more complicated than the corr...

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