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how to draw the molecular orbital energy level diagram for cl2 and s2?
Mo diagram of Cl is similar to F and S is similar to O

1. MO diagram of Cl:
     [Ne] 3s2 3p5

                        
                    *3pz
                
               *3px *3py
px  py  pz             px  py  pz
          
       3p                        3p                 
                 
                3px 3py
                   
                      3pz



              
               *3s
3s               3s

              
               3s

Since it has no unpaired electron it is diamagnetic
 Bond Order is 1/2 (B.O - A.O)
                     = 1/2 (6-4) = 1 (Cl,Cl bond is single bond)

2. MO diagram of S:
     [Ne] 3s2 3p4

                      
                    *3pz
                  
           *3px *3py
px  py  pz           px  py  pz
          
       3p                        3p                 
                 
                3px 3py
                   
                      3pz



              
               *3s
3s               3s

              
               3s

Since it has two unpaired electron it is paramagnetic
 Bond Order is 1/2 (B.O - A.O)
                     = 1/2 (6-2) = 2 ---- means double bond