Answer
Major contributions:
Dalton - described atoms as small and indestructible
Thomson - discovered the electron
Rutherford - discovered the nucleus, and that it is small, dense, and has a positive charge
Bohr - created the Bohr Model of the atom in which atoms moved in circular paths, or orbits
Shrodinger - developed Quantum Mechanical Model which describes motions of electrons in atoms
Work Step by Step
Based on information provided on page 133 of the textbook
