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This is despite the very different properties conferred on the acceptor centre by the small electronegative fluoride ligands compared to the heavier halides .
 Chemical: fluoride; Chemical: halides
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: fluoride; Chemical: halides