16473
This work culminated in the solar-system-like ( but quantum-limited ) Bohr model of the atom in the same year , in which a nucleus containing an atomic number of positive charges is surrounded by an equal number of electrons in orbital shells .
 Bohr
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Bohr