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Explain why : The electron affinities...

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

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ICSE-CLASSIFICATION OF ELEMENTS AND PERIODICITY IN PROPERTIES-ESSAY (LONG ANSWER) TYPE QUESTIONS
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  3. What do you understand by the term periodicity ? What is the main caus...

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

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

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

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

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  8. Electron gain enthalpies of noble gases are negative.

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

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  10. Which is more basic : LiOH or NaOH ?

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

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  12. Write short notes on the following : Penetration effect

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  13. Write short notes on the following : lsoelectronic ions

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  14. Write short notes on the following : Periodic trends in melting and...

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  15. The electronic configuration of some elements are given below: (i) 1...

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  16. The electronic configuration of some elements are given below: (i) 1...

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  17. The electronic configuration of some elements are given below: (i) 1...

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  18. The electronic configuration of some elements are given below: (i) 1...

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  19. The electronic configuration of some elements are given below: (i) 1...

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  20. The electronic configuration of some elements are given below: (i) 1...

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