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Which of the following factor may be reg...

Which of the following factor may be regarded as the main cause of lanthanide contration ?

A

Poor shielding of one of the 4f electrons .

B

Effective shielding of one of the 4f electrons by another in the sub shell

C

Poor shielding of 5d electron by 4f electrons

D

Greater shielding of 5d electrons by 4f electrons.

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SHARAM PUBLICATION-D AND F BLOCK ELEMENTS-EXERCISE
  1. Which of the following factor may be regarded as the main cause of lan...

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  2. Which element does not show variable oxidation state ?

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  3. Which of the following oxidation state-is the most common among the la...

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  4. In the first transition series which of the following has lowest entha...

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  5. Which of the following is not a transition element ?

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  6. Formation of intertitial compounds make the transition metal :

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  7. Which of the following ion is colourless in aqueous solution ?

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  8. Which of the following statement about transition elements is correct ...

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  9. Permanent magnets are generaly made of alloys of :

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  10. In which of the following pairs, both the ions are coloured in aqueous...

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  11. The main reason for the large number of oxidation states exhibited by ...

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  12. Among the following out electronic configuration of atoms the highest ...

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  13. A reduction in atomic size with increase in atomic number is a charact...

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  14. The magnetic character of transition elements of its ion is due to

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  15. Which of the following transition metals show the maximum oxidation st...

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  16. Among the following series of transition metal ions the one where all ...

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  17. Which of the following d- block elements has half filled penultimate d...

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  18. The catalyst used for olefin polymerisation is

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  19. The malleability and ductility of metals can be accounted due to

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  20. Write down the electronic configuration of gadolinium (Gd). Its atom...

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