52768
With J. J. Thomson 's discovery of the electron in 1897 , it became clear that atoms were not the smallest building blocks of nature , but were rather composite particles .
 person: J. J. Thomson
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
 Entities: J. J. Thomson 
Answer:
 person: J. J. Thomson