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(a) How does the electropositive charact...

(a) How does the electropositive character of elements change on going down in a group of the periodic table?
(b) State how the valency of elements varies (i) in a group and (ii) in a period, of the periodic table.

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LAKHMIR SINGH & MANJIT KAUR-PERIODIC CLASSIFICATION OF ELEMENTS-Exercise
  1. A part of the early classification of elements has been given below: ...

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  2. (a) Explain why: (i) All the elements of a group have similar chemic...

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  3. (a) How does the electropositive character of elements change on going...

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  4. (a) What is the fundamental difference in the electronic configuration...

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  5. (a) What is the usual number of valence electrons and valency of group...

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  6. (a) What is the main characteristic of the last elements in the perio...

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  7. (a) How does the atomic size vary on going down form top to bottom in ...

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  8. (a) How does the tendency to lose electrons change as we go down in gr...

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  9. (a) Why does the side of the atoms progressively become smaller when w...

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  10. (a) In the modern Periodic Table, why does cobalt with higher atomic m...

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  11. (a) Explain why the first period of the modern periodic table has only...

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  12. (a) What is a group in the periodic table in which part of a group wou...

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  13. Which of the following statements is not a correct statement about the...

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  14. The electronic configuration of the atom of an element X is 2,8,4. In ...

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  15. The atomic number of an element is 20. In modern periodic table, this ...

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  16. Five elements A, B, C, D and E have atomic numbers of 2, 3, 7, 10 and ...

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  17. The elements A, B, C, D and E have atomic number 9, 11, 17, 12 and 13 ...

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  18. Which of the following elements would lose an electron easily ?

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  19. Which of the following elements does not lose an electron easily ?

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  20. Where would you locate the element with electronic configuration 2,8 i...

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