|  |  |  |  |  |  |  |  |  | 
   
    | • | Electrons can be
    found only in certain allowed 
 |  | 
   
    |  | 
   
    |  | energy levels
    (orbits). Not all energies or radii of 
 |  | 
   
    |  | 
   
    |  | orbits are
    allowed--quantized. 
 |  | 
   
    |  | 
   
    | • | As orbits get
    further from nucleus, energy of orbit 
 | 
   
    |  | 
   
    |  | increases. 
 |  | 
   
    |  | 
   
    | • | According to Bohr
    one can know the location and 
 |  | 
   
    |  | 
   
    |  | energy of an
    electron in an atom with certainty. 
 |  | 
   
    |  | 
   
    | • | Read the summary
    of Bohr theory on p 46 
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