why should two electrons in an orbital cannot have same spin?

							
Dear student,
The magnetic moment of electrons is due to a property called "spin"; the  spin value of an electron is 1/2, so it can adopt one of two spin  quantum states, +1/2 and -1/2, which correspond to the "up" and "down"  orientations of the magnetic moment.  Since it has a half-integer spin,  an electron is a member of a class of sub-atomic particles called  "fermions" which obey rules called the Pauli Exclusion Principle and  Fermi-Dirac statistics - one key result of these rules is that no two  identical fermions can simultaneously occupy the same quantum state: you  cannot have two electrons in the same orbital if they have the same  spin orientation, so if one is +1/2, the other must be -1/2, and no more  can be added because a third would have to adopt the same quantum state  as the one of the first two.
 







Please feel free to ask your queries here. We are all IITians and here to help you in your IIT JEE preparation.
All the best.
Win exciting gifts by                                           answering the questions on        Discussion        Forum.    So      help         discuss     any              query   on        askiitians  forum   and      become an     Elite            Expert    League            askiitian.
Now you score 5+15 POINTS by uploading your Pic and Downloading the Askiitians Toolbar  respectively : Click here to download the toolbar..
 
Askiitians Expert
Sagar Singh
B.Tech, IIT Delhi
sagarsingh24.iitd@gmail.com