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1. (1!) (1!) (1!)(1 )( ) 2. (1!) (1!) (1)(1) (1) 3. (1!) (1!) (1)(!)(1) here one (1) is the upper arrow and (!) this is the downward arrow...... among these above mentioned electronic configuration ,which one is correct ?substantiate your answer.
1 and 3 does not follow Hunds rule.

ie., Filling of p orbitals are not correct, 2px2 and 2py1 is not possible it will be 2px1, 2py1,2pz1 with same spin ()

  Also filling  of electrons do not follow different spin . Same spin  will place first and then opposite spin

                        
                    


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