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Research the Scientist and summarize their contributions to the Atomic Theory<br />
You must have 2 to 3 complete sentences for each Scientist<br />
Antoine Henri Becquerel<br />
He discovered the idea of radioactivity in atoms. He had found some visible radiation around some uranium and<br />
thats how he made his discovery.<br />
Niels Bohr<br />
He created a new model for the atom that was improved later on to become the model we use nowadays. His model<br />
suggested that electrons follow a specific orbit around the nucleus which was later proved to be untrue.<br />
Louis de Barogilie<br />
He developed the theory that electrons can act both as particles and waves. His theory was named the wave mechanics<br />
theory.<br />
Glenn Seaborg<br />
He helped to identify 8 new elements, one of which was named after him. He also made discoveries in transuranium<br />
elements.<br />
Hantaro Nagaoka<br />
He proposed the planetary model of the atom. This model displayed a massive atomic center with the electrons revolving<br />
around it much like the way planets revolve around the sun.<br />
Democritus<br />
Democritus was the first person to come up with the basic idea of an atom and he suggested there were many types of<br />
atoms. He suggested that everything was made up of these tiny particles (atoms).<br />
Marie and Pierre Curie<br />
The couple discovered radation and that the amount of radiation depends on the amount of the element. They first<br />
discovered this working with elements such as Thorium.<br />
Eugene Goldstein<br />
He discovered rays that were present with electrons but they went in the opposite direction of the positive charge. He named<br />
these rays "canal rays".<br />
Dmitri Mendeleev<br />
He was the man who introduced the metric measurement system in Russia. Mendeleev also created the periodic<br />
table of elements that we use today, which helps alot when working with elements and atoms.<br />
J.J. Thomson<br />
He created a model of the atom that stated that electrons lied inside the nucleaus of the atom.This model was named the<br />
pudding atomic model and was later proven to be inaccurate.<br />
James Chadwick<br />
James Chadwick recognized that there are neutral particles within the atom. This new discovery changed the understanding<br />
we had on atomic structure.<br />
Erwin Shrodinger<br />
Erwin came up with the electron cloud model. The model stated that electrons are found within the electron cloud and<br />
their path can not be predicted accurately.<br />
John Dalton<br />
Dalton proved the idea that elements are made up of atoms. Although his ideas were similar to those of Democritus,unlike<br />
him Dalton's ideas were excepted.<br />
Lothar Meyer<br />
He classified the elements in the periodic table of elements. He did this by ordering the elements by atomic weight.<br />
Robert Millikan<br />
He discovered that electrons had a negative charge. This discovery helped to lead to the identification of the mass of an<br />
electron.<br />
J.W. Dobereiner<br />
Similar to Meyer, he grouped the elements in the periodic table together.He had found trends in atomic mass and grouped<br />
the similar elements together.<br />
Ernest Rutherford<br />
Rutherford was the first to discover the existance of atoms. By studying how x rays pass through objects he discovered<br />
them<br />
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