Answers

2015-07-28T12:22:41+05:30
In each sub-shell 2 electrons can be filled . if half orbitals is filled then each sub-shell should have one electron , so it is stable ...it is fully filled when all sub-shells are filled by 2electron so, it is also stable . as uh can see in pic
 
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2015-07-28T14:57:38+05:30
The half filled and completely filled orbitals are symmetrical when compared to other configurations and exchange energy is maximum so that they are more stable when compared to other configurations.
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