Solid Sphere Model of the atom: John Dalton, Earliest model of the atom, No subatomic particles in this model!, , Chocolate Chip Cookie Dough Model of the atom: first model of the atom with any subatomic particles, J. J. Thomson, discovered the electron, negative electrons in a positively charged 'dough', , Nuclear Model of the atom: Ernest Rutherford, Nuclear Model, Small, dense positively charged nucleus that contains virtually all of the mass of an atom, An atom is mostly empty space., , Planetary Model of the atom: Niels Bohr, electrons can only be in specific energy levels - not between them, Electrons orbit the nucleus in energy levels, , Quantum Mechanical Model of the atom: electrons have both wave and particle characteristics, also referred to as the electron cloud model, Small, dense nucleus surrounded by a cloud of rapidly moving electrons, Ewin Schrodinger, ,

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