The first scientist was Sir Isaac Newton. True, the atom was not his greatest achievement, but he had a mutual association with it. The latter part of Newton's book Optiks is a series of speculations on the atomic nature of matter, indicating how some of matter's properties are to be understood in terms of atoms. (http://physics.hallym.ac.kr/education/qm/mitqm/804f/.html) Newton needed the atom to help him write this book.

Robert Boyle was similar to Newton in his association with the atom. Boyle's work in chemistry was aimed at establishing the atom as a rational theoretical science on the basis of a mechanistic theory of matter. Boyle was a skillful experimenter who insisted that experimentation was an essential part of scientific proof . (http://webpub.allegheny.edu/employee/g/grodgers/ScientificTravelingWebsite/Boyle.html)

The atom also helped the famous chemist Mendeleev. Mendeleev was the chemist that made the periodic table.

nuclear fission. He was the scientist that delivered the message of them splitting the atom. While his model that he proposed was wrong in his basic ideas, he suggested that electrons revolve around the nucleus in specific energy levels. His contributions were substantial to our way of thinking about the atom now. "Neils Bohr." Rose M. Robacker. 1994 Flinn Scientific Inc.

The finial and possibly biggest scientist is J. J. Thomson. His model is shown below. In 1897, Joseph John Thomson found a stream of negatively charged particles with individual masses much smaller than that of any atom. These particles were called electrons. Thomson's work with cathode rays was helped by Crookes model. For the first time our atom is a positively charges sphere with electrons (negative charge) in it. (http://www.aip.org/history/electron/jjhome.htm)

http://www.pbs.org/wgbh/aso/databank/entries/bpschr.html http://www..colorado.edu/physica/200/intrduction.html

Max Planck made many contributions to science however. His most essential one, by far, was his quantum constant. In the equation E=hv lies his greatest contribution. The quantum explains the changing of electrons to other energy levels. At first by his, own admission, he didn't understand the equation. However he stayed determined and for his efforts he was given the Nobel Prize in 1918."Max Planck." Rose M. Robacker. 1994 Flinn Scientific Inc.

model was flawed he didn't fight the new wave of thinking but encouraged it. Also in his career he proposed isotope U-135, the isotope that led to

Niels Bohr's achievements set basic principles in the structure of the atom. He was the designer of the planetary model of the atom. He stated th

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