52783
In 1909 , Ernest Rutherford discovered that the bulk of the atomic mass was tightly condensed into a nucleus , which was also found to be positively charged .
 Ernest Rutherford
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Ernest Rutherford