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Research the Scientist and summarize their contributions to the Atomic Theory<br />
Antoine Henri Becquerel<br />
Niels Bohr<br />
Louis de Barogilie<br />
He had a early contribution in the Atomic Theory. He accidentally discovered radioactivity while<br />
experimenting with fluorescence in uranium salts. His discovery was not truly appreciated until<br />
later discoveries that made his relevant, giving it validation.<br />
Proposed a theory for the hydrogen atom based on quantum theory that energy is transferred only in certain<br />
well defined quantities. He also created what is known as Bohr's atomic model showing his theory.<br />
Developed a revolutionary theory of electron waves, which postulated the wave nature of electrons<br />
and suggested that all matter has wave properties.<br />
Glenn Seaborg<br />
Discovered the element plutonium and all further transuranium elements through element 102.<br />
Hantaro Nagaoka<br />
Proposed an alternative planetary model of the atom in which a positively charged center is surrounded<br />
by a number of revolving electrons, in the manner of Saturn and its rings.<br />
Democritus<br />
First proposed the idea that all matter was made up of tiny indivisible particles called atoms.<br />
Marie and Pierre Curie<br />
They discovered two other radioactive elements, polonium and radium.<br />
Eugene Goldstein<br />
He discovered protons with the experiments he did with cathode rays .<br />
Dmitri Mendeleev<br />
He discovered that the properties of elements "were periodic functions of the their atomic weights".<br />
This became known as the Periodic Law.<br />
J.J. Thomson<br />
James Chadwick<br />
Performed a CRT experiment and determined that the ray was composed of negative particles, call these<br />
electrons, determined the mass-charge ratio for an electron,and came up with the "plum pudding" model of<br />
the atom.<br />
Discovered the nutron.<br />
Erwin Shrodinger<br />
Expanded upon the idea that electrons behaved as particles and waves, and Developed the quantum<br />
mechanical model of the atom.<br />
John Dalton<br />
He formulated an atomic theory of matter with 4 postulates.<br />
Lothar Meyer<br />
He was one of the pioneers in developing the first periodic table of chemical elements.<br />
Robert Millikan<br />
Determined the charge of one electron and using the known mass-charge ratio, was able to calculate the<br />
mass on one electron<br />
J.W. Dobereiner<br />
Discovered trends in certain properties of selected groups of elements.<br />
Ernest Rutherford<br />
Found that atoms contained a very small, positively charged core at the center, called this core the<br />
nucleus, came up with the nuclear model of the atom<br />
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