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Lanthanoids are...

Lanthanoids are

A

14 elements in the sixth period (atomic no. = 58 to 71) that are filling 4f sublevel

B

14 elements in the seventh period (atomic no. = 58 to 71) that are filling 4f sublevel

C

14 elements in the sixth period (atomic no. = 90 to 103) that are filling 4f sublevel

D

14 elements in the seventh period (atomic no. = 90 to 103) that are filling 4f sublevel

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The correct Answer is:
A
As sixth period can accommodate only 18 elements in the table, 14 member of HF series (atomic number 58 to 71) are separately accommodated in a horizontal row below the periodic table. These are called as lanthanides.
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ERRORLESS-THE d-AND f- BLOCK ELEMENTS -Past Years Questions
  1. Which of the following does not have valence electron in 3d-series ?

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  2. Mercury is the only metal which is liquid at 0^@C this is due to its

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  3. Lanthanoids are

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  4. Which of the following oxidation states is the most common among the l...

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  5. Identify the incorrect statement among the following

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  6. Because of lanthnoid contraction, which of the following pairs of elem...

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  7. Lanthanide for which +II and +III oxidation states are common is

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  8. Which of the following exhibits only +3 oxidation state?

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  9. Which of the following lanthanoid ions is diamagnetic ? (At nos . Ce...

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  10. Which one of the following statements related to lanthanons is incorre...

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  11. The electronic configuration of Eu (Atomic No. 63), Gd (Atomic No. 64)...

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  12. The correct order of ionic radii Y^(3+) , La^(3+) , Eu^(3+) and Lu^(3+...

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  13. The reason for greater range of oxidation state in actinoids is attrib...

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  14. Reacttion between the following pairs will produce H(2) except

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  15. Which of the following compounds is coloured

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  16. Which of the following compounds is not coloured ?

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  17. The nitrate of which metal left globule on heating strongly

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  18. K(2)Cr(2)O(7) on heating with aqueous NaOH gives

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  19. Acidified K(2)Cr(2)O(7) solution turns green when NasO(3) is added to ...

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  20. Which one of the following statements is correct when SO(2) is passed ...

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