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http://www.nobelprize.org/nobel_prizes/physics/laureates/1922/bohr-bio.htmlhe extended upon Rutherford's atomic theory by proposing that electrons travel only in certain successively larger orbits. He said that the outer orbits could hold more electrons than the inner ones, and that these outer orbits determine the atom's chemical properties.
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http://www.nobelprize.org/nobel_prizes/physics/laureates/1906/thomson-bio.html
Determined the basic structure of an atom. -
http://www.rutherford.org.nz/
Discovered that the atom is not the smallest unit and discovered the nucleus. -
http://www.nobelprize.org/nobel_prizes/physics/laureates/1935/chadwick-bio.html
Proved the existance of Neutrons -
http://plato.stanford.edu/entries/democritus/
Discovered that atoms are infinite and makeup everything.
