From: reusmvb@gmail.com   
      
   Hello   
   I was reading about the octet rule exceptions and it said that SF6 is one of   
   those exceptions because it has more than 4 bonds therefore more than an   
   octet, but it also said that the electrons will ill the 3d orbital, that is   
   the part that didn't make    
   sense to me, why would the electrons fill the 3d orbital before the 4s   
   orbital, isn't the 4s orbital lower in energy then the 3d?   
      
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