Saturday, May 14, 2011

Stability of Half-Filled and Fully Filled Orbitals

The exactly half-filled and fully filled orbitals have greater stability than other configurations.
The reason for their stability are symmetry and exchange energy.
(a).    Symmetry
         The half-filled and fully-filled orbitals are more symmetrical than any other configuration and symmetry leads to greater stability.
(b).     Exchange Energy

The electrons present in the different orbitals of the same sub-shell can exchange their positions. Each such exchange leads to the decrease in energy known as Exchange Energy. Greater the number of exchanges, greater the exchange energy and hence greater the stability. As the number of exchanges that take place in the half-filled and fully-filled orbitals is maximum, thus exchange energy is maximum and hence maximum stability.

23 comments:

  1. not satisfactory man chemwiki

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  2. I did not get my answer. Please explain in detail

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  3. Which is more stable? Half or completely filled?

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  4. Which is more stable? Half or completely filled?

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  5. Didn't understand properly, elaborate more please

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  6. Didn't understand properly, elaborate more please

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  7. itz good and well explained if someone can't understand just go to the basics

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  8. when the subshell is half filled electron is arranged in symmetrical manner such that the net force due to nucleus and other electrons becomes low and the stability of electron in an atom increases.
    also due to possible exchange in position of electron the stability increases.
    suppose you have 3 house and i have one. if both of us will have to leave one house, u still has 2 houses so u can go there. but what about me, i will become unstable. i guess now u can understand. :)

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  9. Can u elaborate it nicely

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  10. Thank you so much. So well explained then other rubbish answers

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  11. Why is number of exchanges greater in half filled or full filled orbitals

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  12. when they exchange there position in degenarate orbitals there should be no loss of energy as energy all same for all . Please tell why this happen ?

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  13. A fully filled 3d and partially filled 3d which on will have the greatest stability

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  15. Thanx for this knowledge it really helped me a lot please reply

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