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Write the minimum and maximum valencies ...

Write the minimum and maximum valencies of elements. 

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The minimum valency exhibited by an element is zero. The maximum valency exhibited by Os, Ru or Xe in its compounds is 8.
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AAKASH SERIES-PERIODIC TABLE-QUESTIONS FOR DESCRIPTIVE ANSWERS
  1. Write the minimum and maximum valencies of elements.

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  2. Write on the IUPAC nomenclature of the elements with atomic number gre...

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  3. What are the groups, periods and blocks of the elements with atomic nu...

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  4. How are the elements classified based on thedifferentating electron co...

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  5. Knowing the electronic configuration of an element, its position in th...

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  6. What is electronegativity? How is this useful in understanding the nat...

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  7. How does the position of element in the periodic table useful in findi...

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  8. Write the important applications of electronegativity.

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  9. What is electron gain enthalpy? On what factors does it depend?

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  10. What is the role played by the  inner electrons on the radius and ioni...

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  11. Write the differences between ionisation enthalpy and electron gain en...

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  12. Write the increasing order of ionisation enthalpies of Be, B, C, N and...

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  13. Which among the following should have a smaller second ionisation ener...

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  14. How are bond energies useful for the calculation of electronegativity?

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  15. Both ionisation enthalpy and electron gain enthalpy have some irregula...

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  16. With reference to the periodic table, name the following : (a) the h...

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  17. Mention different chemical criteria to call an element as metal.

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  18. How do you account for the highly electro-positive nature of alkali me...

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  19. What are anhydrides? Write exmples of acidic and basic anhydrides.

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  20. Alkali metals are good reductants and halogens are good oxidants. Why?

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  21. Comment on the following : (a) vertical relationship of elements, (b...

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