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How does the position of element in the ...

How does the position of element in the periodic table useful in finding valency and oxidation number? 

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AAKASH SERIES-PERIODIC TABLE-QUESTIONS FOR DESCRIPTIVE ANSWERS
  1. Knowing the electronic configuration of an element, its position in th...

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

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

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  4. Write the important applications of electronegativity.

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

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

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

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

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

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

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

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

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

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

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

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

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

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  18. How many periods are needed to accommodate all elements up to Z value ...

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  19. How is polarisation power useful in explaining the diagonal relationsh...

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  20. I1 and I2 of an element are 700 and 1200 kJmol""^- If 1000 kJ "mol"^(-...

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