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Author Topic: why are fully filled and half filled sub shells more stable?  (Read 3539 times)

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athrun

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why are fully filled and half filled sub shells more stable?
« on: March 22, 2006, 02:40:42 PM »

why are fully filled and half filled sub shells more stable?

what are the reasons for the above?

thx!
« Last Edit: March 22, 2006, 03:07:51 PM by athrun »
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Moonshyne

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Re:why are fully filled and half filled sub shells more stable?
« Reply #1 on: March 22, 2006, 07:02:23 PM »

I think it's because it takes less energy to store an electron in a half-filled or completely-filled d shell rather than a filled s shell. Like in Cr with the electron configuration [Ar]4s13d5, the last valence electron goes to the 3d shell instead of the 4s shell because it takes less energy to store it in 3d.
-hope this helps
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xiankai

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Re:why are fully filled and half filled sub shells more stable?
« Reply #2 on: March 22, 2006, 09:14:47 PM »

the 3d subshell has a higher energy associated with it compared to the 4s subshell, so i think its related Pauli's exclusion principle...

where each electron would prefer to have its' own orbital as compared to sharing one with another; in this case mutual repulsion between the 4s1 and 4s2 electron is not preffered to all 6 electrons occupying their own orbits with minimal interference from each other other electron.

thats what i was taught..
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athrun

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Re:why are fully filled and half filled sub shells more stable?
« Reply #3 on: March 23, 2006, 12:22:49 PM »

hey moonshyne and xiankai, thx for the *delete me*

does make more sense now
 :)
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