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(a) What is the usual number of valence ...

(a) What is the usual number of valence electrons and valency of group 18 elements of the periodic table?
(b) What happens to the number of valence electrons in the atoms is elements as we go down in a group of the periodic table?

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The correct Answer is:
(a) Usual number of valence electrons is 8; Valency is 0(zero) (b) The number of valence electrons remains the same
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LAKHMIR SINGH & MANJIT KAUR-PERIODIC CLASSIFICATION OF ELEMENTS-Exercise
  1. (a) How does the electropositive character of elements change on going...

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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  19. An element which is an essential constituent of all organic compounds ...

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  20. Which of the following is the valence shell for the elements of second...

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