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Why are lanthanides and actinides p...

Why are lanthanides and actinides placed separately at the bottom of the periodic table ?

A

To reduce size of periodic table

B

To reduce no. of elements

C

They are not a part of periodic table

D

They are not stable elements

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VGS PUBLICATION-BRILLIANT-CLASSIFICATION OF ELEMENTS-THE PERIODIC TABLES-EXERCISE
  1. Which of the following elements are not available at the time of Mende...

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  2. Which of the following element does not contain '3s' orbital ?

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  3. Why are lanthanides and actinides placed separately at the bot...

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  4. If 'He' is not a inert gas, it should be placed in the group.

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  5. n = 1: 1s ::n = 2: ………….

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  6. Guess the period if it has only '8' elements and K, L shells.

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  7. Which one shrinks in size than atom : i) Na^+ii) Na iii) Cl^- iv) CI

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  8. The ionization potential of 'Be' is more than 'B'. This is due to

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  9. Assertion (A) : The size of Na^+ ion is less than 'Na' atom. Reason (R...

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  10. The element at the bottom of a group would be expected to show ...

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  11. The outermost main shell of an element is 'M' shell. This element belo...

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  12. Give example where the electronic configuration of an element does not...

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  13. generally show less electronegative character.

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  14. The atomic radius of Cl than Cl^- atom.

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  15. cannot be decomposed into further substance by a physical or chemical ...

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  16. Which one shrinks in size than atom : i) Na^+ii) Na iii) Cl^- iv) CI

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  17. Atomic number of the element which has diffe rentiating electron enter...

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  18. Which of the following is the correct order of electron affinity

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  19. Electron affinity of Fluorine is less than that of Chlorine because

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  20. Which one of the following ion has the highest value of ionic radius?

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