Monday, June 20, 2011

Factors Influencing Ionisation Energy

The various factors which influence the Ionisation energy are;
¤    Size of atom
The Ionisation energy depends upon the size of atom, because with increase in size, the distance between nucleus and valence electrons increases and hence force of attraction between nucleus and valence electron decreases. As a result of which the valence electrons are loosely held and smaller energy is required to remove an electron. Thus Ionisation energy decreases with increase in size and increase with decrease in size.
¤    Nuclear charge
As the nuclear charge increases, the force of attraction between nucleus and valence electrons increases and hence it is difficult to remove an electron from valence shell. Thus with increase in nuclear charge, the Ionisation energy increases.
¤    Screening effect or Shielding effect
The inner electrons present in shells between nucleus and valence shell reduce the attraction between nucleus and the outermost electrons. This shielding effect depends upon the number of inner electrons. Larger the number of electrons in the inner shells, the greater is the screening effect. More the Shielding effect, easier will be to remove an electron and hence lesser will be ionisation energy.
¤    Penetration effect
s – electrons are closer to the nucleus than p-electrons, which is closer than d – electron and these inturn are closer than f-electrons of the same principle energy level. Hence s – electrons experience more attraction from the nucleus than p, d and f – electrons. Thus Ionisation energy to remove an electron from a given energy level decrease in order s > p > d > f.
¤    Electronic Configuration
Electronic Configuration plays vital role in determining the value of Ionisation energy. Atoms having stable configuration (i.e. fully filled or half filled) has least tendency to lose electron and hence have high value of I. E.

30 comments:

  1. well explained answers.Excellent!

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  2. Your explanation is really clear and to the point! Thanks so much! :)

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  3. Really really helpful thank you so much

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  4. yr explanation is tooo helpful........:) :) :).......

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  5. explain quantitatively, use chemistry.

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  6. Thanks from Pakistan

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  7. insufficient and vague info. Explanation on penetration effect is not upto the mark.

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  8. info helpful upto school level.
    so thanks from school students and duh! from collegians

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  10. Thanks a lot......its very helpful for school students

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  11. Thanks a lot......its very helpful for school students

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  12. It is really good, add some more information

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  13. Your explanation was explicitly clear. Thank you. Keep up the good work in sharing your knowledge. Could you explain the kinetic theory of gases?

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  14. I have doubt on ionisation on which factors ionisation was given to the patient. And how many ions can enter into tissue during treatment
    Thank you

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  15. does it depend on mass of particles

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  16. Really helpful
    It helped me a lot for preparing my topic for demo teaching when my teacher denied to help me
    Thank you very much

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  17. Thank u
    It's very helpful. .

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  18. So helpful for my plus one science

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  19. Its vry hlpful for schl students....it gives infrmtn about ncert chem...outstanding..πŸ‘ŒπŸ‘ŒπŸ‘ŒπŸ‘Œ

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  21. This was very helpful
    Thank you from GuyanaπŸ™‚

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  22. Thank you so much! From Kenya!

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  23. This comment has been removed by the author.

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