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Give a brief account of the historical d...

Give a brief account of the historical developments in the classification of elements.

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ICSE-CLASSIFICATION OF ELEMENTS AND PERIODICITY IN PROPERTIES-ESSAY (LONG ANSWER) TYPE QUESTIONS
  1. Give a brief account of the historical developments in the classificat...

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  2. State the law on the basis of which Mendeleev classified the elements....

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  3. Compare the known properties of germanium with those predicted by Mend...

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  4. What is modern periodic law? Mention the important features of the lon...

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  5. Justify the position of hydrogen in the periodic table on the basis of...

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  6. What is the basis of splitting the long form of the periodic table int...

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  7. How can the elements be classified on the basis of their electronic co...

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  8. What do you understand by the term periodicity ? What is the main caus...

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  9. What do you understand by the term periodicity ? What is the main caus...

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  10. What do you understand by the term periodicity ? What is the main caus...

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  11. What do you understand by the term periodicity ? What is the main caus...

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  12. Define various types of atomic radii. Why is covalent radius smaller t...

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  13. What do you understand by first, second and third ionisation energies ...

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  14. Define electron gain enthalpy. Explain why electron gain enthalpies of...

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  15. Electron gain enthalpies of noble gases are negative.

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  16. Explain why : The electron affinities of Be and Mg are zero.

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  17. Which is more basic : LiOH or NaOH ?

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  18. Explain why : The second ionisation energy of Li is very high.

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  19. Write short notes on the following : Penetration effect

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  20. Write short notes on the following : lsoelectronic ions

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