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* Ne-20 , Ne-21 , Ne-22
* Mg-24 , Mg-25 , Mg-26
* Si-28 , Si-29 , Si-30
* O-16 , O-17 , O-18
* C-12 , C-13 , C-14
Y dos mas por si a caso :
* Cl-35 , Cl-36 , Cl-37
* H-1 , H-2 , H-3