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Which pair of elements are lanthanides ?...

Which pair of elements are lanthanides ?

A

Pa, Pu

B

Pm, Sm

C

Re, Rh

D

Ag, Hg

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BEYOND PUBLICATION-CLASSIFICATION OF ELEMENTS THE PERIODIC TABLE-EXERCISE
  1. Which of the following atomic numbers belongs to same period ?

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  2. The size of Na^+ is less than 'Na' . This is due to

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  3. Which pair of elements are lanthanides ?

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  4. Arrange the following elements in the order of their decreasing metall...

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  5. Arrange the following elements in the order of their increasing non-me...

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  6. Which of the following elements gives the correct increasing order of ...

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  7. Which of the following reasons corresponds to decrease in IP value fro...

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  8. Nuclear charge increase both in a period and group. But, effective nuc...

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  9. Nitrogen (Z=7) is the element of group V of the periodic table. Which...

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  10. Which of the following group elements are called alkali metal family ?

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  11. An element M, is in the 13th group, the formula of its chloride is

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  12. Which of the following sets does not belong to a group ?

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  13. Which is the wrong sequence of the elements in a group ?

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  14. Which of the following sets of elements belongs to alkali metals ?

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

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  16. Which of the following is an element in 3^rd period II group

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  17. Actinides belongs to period.

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  18. The electronegativity of the following elements increase in the order

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  19. The incompletely filled period is

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  20. The element for which the electronic configuration does not justify it...

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