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These results allow us to establish that , when the halogen atom is bonded to a group with high electron - withdrawing capacity , the electrostatic interaction between the electron cloud of the Lewis base and the halogen atom unprotected nucleus of the Lewis acid produces the formation and determines the geometry of the halogen bonded complexes .
 halogen, Lewis base, halogen, Lewis acid, halogen
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 halogen, Lewis base, halogen, Lewis acid, halogen