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Why do the melting points decrease in go...

Why do the melting points decrease in going from NaF to Nal?

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ICSE-CLASSIFICATION OF ELEMENTS AND PERIODICITY IN PROPERTIES-SHORT ANSWER TYPE QUESTIONS
  1. Define ionisation energy . What is its value for a hydrogen atom ?

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  2. Why is anion larger than its parent atom ?

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  3. Define valency. How does it change across a period and on going down a...

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  4. Why is the second ionisation energy of an element much greater than it...

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  5. Explain what do you understand by screening effect. How does this effe...

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  6. Arrange with explanation the following elements in the increasing orde...

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  7. Why do the alkali metals possess minimum and the noble gases maximum i...

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  8. Why is the ionisation energy of beryllium greater than that of Li and ...

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  9. Why does the ionisation energy decrease on going down a group?

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  10. Among the elements of second period pick out the element with the m...

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  11. Among the elements of second period pick out the element with the mo...

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  12. Among the elements of second period pick out the element with the l...

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  13. Among the elements of second period pick out the element that is th...

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  14. Among the elements of second period pick out the element that is the...

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  15. Why does the fourth period have eighteen and not eight elements?

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  16. The valency of a representative element is either equal to the number ...

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  17. Why do noble gases have positive electron gain enthalpies?

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  18. Two elements X and Y possess the following electronic configuration ? ...

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  19. Why do the melting points decrease in going from NaF to Nal?

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  20. Li(2)CO(3) decomposes on heating but the carbonates of other alkali me...

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