THOMSON'S MODEL THAT INTRODUCES ELECTRONS; RUTHERFORD'S MODEL THAT DISCOVERS THE NUCLEUS; BOHR'S MODEL WHICH ENCLOSES THE ELECTRONS IN 7 ORBITS FROM WHICH THEY CAN ESCAPE ONLY BY ABSORBING THE RIGHT ENERGY; SCHROEDINGER'S MODEL WITH LOTS OF LEVELS, SUBLEVELS, ORBITALS, QUANTUM NUMBERS AND ELECTRONIC WAVES SUBJECTED TO THE UNCERTAINTY PRINCIPLE