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Atom Timeline

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by

Lexie Pawlak

on 7 February 2014

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Transcript of Atom Timeline

1900
1950

1777
June 2011
Lexie P, Justin P, Allie P, Gabbie B
Atom Timeline
Democritus
Democritus made a theory that atoms were merely a matter of combination and re-combination of eternal bits of immutable stuff that remain indivisible in and of themselves, but are capable by hooks and barbs or joints to combine to other atoms to make up the materials of life.
Stated that shapes of objects were determined by the atoms structure, and that some atoms (called soul atoms) were released into the world and Earth after someone's soul left the body.
We chose Democritus because he was the first person to really understand that atoms were part of everything and couldn't be split into anything smaller; he followed the footsteps and looked up to Leucippus.
1800
Leucippus
Wilhelm Röntgen
Henri Becquerel
Robert A. Millikan
Produced and detected electromagnetic radiation in a wavelength range
Today are known as X-rays
This great achievement earned him the first Nobel Prize in Physics in 1901.
In honor of his accomplishments, in 2004 the International Union of Pure and Applied Chemistry named element 111, roentgenium, after him..
November 8, 1895
Discovered radioactivity with Marie and Pierre (his doctoral student) Curie
Proved that uranium emitted radiation without an external source of energy such as the sun.
Won the 1903 Nobel Prize in Physics (along with the Curies)
We chose this event because it shows that success comes from failure. Becquerel thought he had failed, but developed his photographic plates with uranium imprints anyways, and made a surprising discovery.
May 1896
Used Thomson's oil-drop experiment to measure the charge of the electron (as well as the electron mass)
Had a partner (Harvey Fletcher) in the discovery, but took full credit. This remained a secret until Fletcher died.
Won the 1923 Nobel Prize for Physics
We selected this event because it shows how scientists base their experiments off of other scientists success, ideas and results

1908
1943-1948
1938
1935
460-370 B.C.
Attended the Case School of Applied Science in 1939 as the only African America student in the school. He then attended the University of California Berkley, then back home to eventually graduate from the University of Illinois School of Chemistry in 1943.
We chose Gardner over others because he was employed on classified research on the Manhattan Project, which resulted in the United States developing the atomic bomb, the use of which ended World War II in 1945.
We chose this event because Gardner is a minority in the scientific world because he was an African American. Also, the Manhattan Project was the cause of a very important moment in world history.
Gardner is now working on his research on catalysis and molecular technology
According to Leucippus' theory, the first principles of reality are fullness, emptiness, and movement.
The arrangement of atoms in Leucippus makes everything in the universe and produces simulacra
According to Leucippus, these are small particles suspended in the void that enter human beings to bring information.
Truth is therefore only to be found in the phenomena themselves and in this way, simulacra stimulate the five human senses.
We chose him because he stated that atoms made up everything in the universe and that they were indivisible, and carved a path for Democritus to discover many more things about atoms.
Lise Meitner
Ernest Rutherford: The Gold Foil Experiment
1911
She attended the University of Vienna in 1901 and studied physics.
Meitner worked together with Otto Hahn for 30 years and they discovered the element protactinium.
We chose Meitner over others because her and her partner then experimented and received evidence for nuclear fission done in Hahn's laboratory. Meitner and her nephew went on to name the process nuclear fission.
She was then awarded the Enrico Fermi Award.
In 1944, Hahn was awarded the Nobel Prize for Chemistry for his research into fission, but Meitner was ignored, partly because Hahn downplayed her role ever since she left Germany
We chose Lisa Meitner because she is a minority chemist because she is a Jewish lady. Her discoveries are important because they were the building blocks to the Manhattan Project in order to build an atomic bomb.
Lavoisier:
Irene Curie is the daughter of Pierre and Marie Curie
After having started her studies at the Faculty of Science in Paris, she served as a nurse radiographer during the First World War.
Irene and her husband, Frédéric Joliot, specialized in the field of nuclear physics. We chose her over others because her and her husbands combined work led to the discovery of artificial radioactivity.
They did this by bombarding boron, aluminum, and magnesium with alpha particles, the Joliot-Curies produced isotopes of the generally stable elements nitrogen, phosphorus, silicon and aluminum that decompose spontaneously by release of positive or negative electrons.
For this work they were awarded the Nobel Prize for Chemistry in 1935.
We chose Irene Curie because she is minority because she is a woman and she worked hard in order to continue the work of her mother and father.
Ralph Gardner
A french chemist who is know to be "The Father of Modern Chemistry"
Created the Law of Conservation of Mass, which states that matter is neither created or destroyed in a chemical reaction
He invented the system of chemical nomenclature still largely in use today
We chose Lavoisier because he created things in the science world that are still used today and still continue to improve the world around us.
1911: Marie Curie

Discovered Radiation by observing that the electrical effects of uranium rays are constant, regardless of whether the uranium was solid or pulverized, pure or in a compound, wet or dry, or whether exposed to light or heat.

1932: James Chadwick
Was a colleague of Rutherford and helped with the gold foil experiment. Soon after Rutherford discovered the proton, Chadwick discovered the neutron, a subatomic particle that carries no electric charge, by realizing the mass of the atom did not add up with the mass of the protons.

Rutherford concluded that an atom consists mostly of empty space through which electrons move. He also concluded that most of the atom’s positive charge and its mass were contained in a nucleus, he later refined this and said the nucleus contained positively charged subatomic particles called protons.
1777
Irene Curie
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