12538
All consideration of nuclear electrons ended with James Chadwick 's discovery of the neutron in 1932 .
 person: James Chadwick
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: James Chadwick 
Answer:
 person: James Chadwick