Hydrogen Atom Energy Levels    

ionization of atom 
 
 

first excited space 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

ground state energy

        Energy   Quantum Level

Energies measured in electron volts, 
    the amount gained by one electron
    traversing one volt potential drop
 
Bound states have negative energies... the binding energies