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In 1911 , Ernest Rutherford gave a model of the atom in which a central nucleus held most of the atom 's mass and a positive charge which , in units of the electron 's charge , was to be approximately equal to half of the atom 's atomic weight , expressed in numbers of hydrogen atoms .
 person: Ernest Rutherford
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: Ernest Rutherford 
Answer:
 person: Ernest Rutherford