-
Daltons Atom
Proposed an "atomic theory" with spherical solid atoms based upon measurable properties of mass. -
J.J. Thomson Atom
Studied "canal rays" and found they were associated with the proton H + . -
Rutherford's Atom
Using alpha particles as atomic bullets, probed the atoms in a piece of thin (0.00006 cm) gold foil . He established that the nucleus was: very dense,very small and positively charged. He also assumed that the electrons were located outside the nucleus. -
Bohr's Atom
Developed an explanation of atomic structure that underlies regularities of the periodic table of elements. His atomic model had atoms built up of sucessive orbital shells of electrons. -
Chadwick's Atom
Using alpha particles discovered a neutral atomic particle with a mass close to a proton. Thus was discovered the neutron. -
Modern Model
Um Still the same as now
