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The name ‘Rare earths’ is used for...

The name ‘Rare earths’ is used for

A

Lanthanides only

B

Actinides only

C

Both lanthanides and actinides

D

Alkaline earth metals

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The correct Answer is:
A
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MOTION-PERIODIC TABLE -Exercise - 1
  1. Which of the following pair of elements follows Newland’s octave rule ...

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  2. From the list given below, elements which belongs to the same group or...

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  3. The name ‘Rare earths’ is used for

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  4. Z/e ratio for N^(3-),O^(2-)and F^(-) respectively will be :

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  5. There are 10 neutrons in the nucleus of the element (Z)M^(19) . It bel...

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  6. The number of elements in 5th and 6th period of periodic table are res...

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  7. The number of elements known at that time when Mendeleev arranged them...

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  8. Which of the following is/are Doeberiners triad (i) P, As, Sb " ...

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  9. As applied to periodic table, which of the following sets include only...

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  10. In the general electronic configuration : (n-2)f^(1-14) (n-1)d^(0-1)...

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  11. For Rb(Z = 37), points out the number of electrons present in L and N ...

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  12. Atomic number of Ag is 47. in the same group, the atomic number of ele...

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  13. Atomic number of 15, 33,51 represents the following family:

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  14. The atom having the valence shell electronic configuration 4s^(2) 4p^2...

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  15. The electronic configuration of an element is 1s^(2)2s^(2)2p^(6),3s^(2...

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  16. ""(92)^(238)U(IIIB) changes to ""(9)^(234) Th by emission of alpha- p...

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  17. The correct order of size would be:

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  18. The ionic radii of N^(3-), O^(2-) and F^(-) are respectively given by:

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  19. Match list-I with list-II and select the correct answer using the code...

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  20. The correct order of atomic size of C, N, P, S follows the order ?

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