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The gradual decrease in size (actionoid ...

The gradual decrease in size (actionoid contraction) is from element to element is greater among the actinoids than that among the lanthanoids (lanthanoid contraction).

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Actinoid contraction is greater than lanthanoid contraction. This is due to the poor shielding by 5f-electrons than by 4f electrons.
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KALYANI PUBLICATION-d- AND- f- BLOCK ELEMENTS-EXERCISE (PART-II) (DESCRIPTIVE QUESTIONS)(VERY SHORT ANSWER QUESTIONS)
  1. Which is more basic La(OH)(3)zor Lu(OH)3 ? Why?

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  2. What is the basic difference between the electronic configurations of ...

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  3. Why do transition elements show similarities along the horizontal peri...

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  4. Why the third ionization energy of manganese (atomic number 25) unexpe...

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  5. Which property of the transition elements makes them good catalysts?

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  6. What are coinage metals ?

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  7. Write the ionic reaction for the reaction between MnO4^(-) ions and ox...

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  8. Write one reaction using alkaline KmnO4.

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  9. Write the electronic configuration of the element with atomic number 1...

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  10. Write the electronic configuration of Cr atom [Z=24].

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  11. Why are Cd^(2+) salts white ?

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  12. Though a transition element, scandium (Z = 21) does not exhibit variab...

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  13. Account for the following: There are irregularities in the electron...

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  14. The gradual decrease in size (actionoid contraction) is from element t...

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  15. La^(3+)(Z=57) and Lu^(3+)(Z=71) do not show any colour in solutions.

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  16. Assign reason for the following Copper (i) ion is not known in aqueo...

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  17. Cr^(2+) is a strong reducing agent whereas Mn^(3+) with the same d^4 c...

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  18. How would you accont for the following? Lanthanoids form primarily +...

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  19. How would you account for the following: Among lanthanoids, Ln(III) co...

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  20. Explain the following observation: The members of the actinoids series...

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