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How would you explain the fact that the ...

How would you explain the fact that the first ionisation enthalpy of sodium is lower than that of magnesium but its second ionisation enthalpy is higher than that of magnesium?

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MODERN PUBLICATION-CLASSIFICATION OF ELEMENTS AND PERIODICITY IN PROPERTIES -NCERT FILE (NCERT EXEMPLAR PROBLEMS) (short answer Questions)
  1. Explain why the electron gain enthalpy of fluorine is less negative th...

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  2. All transition elements are d-block elements, but all d-block elements...

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  3. Identify the group nad valency of the elements having atomic number 11...

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  4. Ionisation enthalpies of elements of second period are given below Ion...

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  5. Among the elements, B, Al, C and Si, a) which element has the highes...

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  6. Choose the correct order of atomic redii of flourine and neon (in pm) ...

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  7. Illustrate by taking examples of transition elements and non-transitio...

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  8. Nitrogen has positive electron gain enthalpy whereas oxygen has negati...

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  9. First member of each group of representative elements (i.e., s and p-b...

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  10. p-block elements form acidic, basic and amphoteric oxides. Explain eac...

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  11. How would you explain the fact that the first ionisation enthalpy of s...

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  12. What do you undestand by exothermic reaction and endothermic reaction?...

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  13. Arrange the elements N, P, O and S in the order of i) increasing fir...

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  14. Explain the deviation in ionization enthalpy of some elements from the...

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  15. Explain the following a) Electronegatively of elements increase on m...

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  16. How does the metallic and non-metalic character vary on moving from le...

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  17. The radius of Na^(+) cation is less than that of Na atom. Give reason.

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  18. Among alkali metals which element do you expect to be least electroneg...

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