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Joseph Proust
Backround: Proust was a french chemist who conducted many tests on chemical substances.
Contribution: He discovered that each pure compound has it's own characteristic elemental composition -
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John Dalton
Dalton became interested in atomism after being greatly interested in meteorology for a long period of time. He kept wheather records from 1787 until his death.
In such research and work, he had singled out the main idea of Chalres law "all elastic fluids expand the same quantity by heat." -
Period: to
Amedeo Avogadro
Backround: Avogadro was born into a family of lawyers. He followed the same path of his family memebers by graduating in law, but in 1800 began private studies in physics and mathmatics. -
Jospeh Proust
The Law of Definite Proportions stated that the proportionof masses of two given elements would always remain the same. -
John Dalton
Contributions: Dalton helped conclude that "all elastic fluids expand the same quantity by heat" of Charles Law. In The Law of Partial Pressures, he claimed that the forces of repulsion thought to cause pressure acted only between atoms of the same kind of chemical philosophy. -
Amedeo Avogadro
Avogadro created memoria about gas densities and how they worked. -
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Hans Geiger
Geiger studied physics at the University of Munich and went on to obtain his doctoral degree at the University of Erlangen in 1906. In 1908, he won a nobel prize in physics. -
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Dmitri Mendeleev
Mendeleev was a Russian chemist and inventor. He created the first version of the periodic table of elements, and used it to predict the properties of elements yet to be discovered. -
Period: to
JJ Thomson
Thomson went to Trinity college, graduated in 1880, finishing second in his class. He also graduated having examination in mathmatics. -
Amedeo Avogadro
After Avogadro's death in 1856, his concept of which is now known as Avogadro's Law was accepted in 1858. This law states that the equal volume of gasses, at the same temperature and pressure, would contain the same number of molecules. -
Period: to
Marie Curie
Curie was a Polish physicist and chemist, working mainly in France, who is famous for her pioneering research on radioactivity. She was the first woman to win a Nobel Prize, the only woman to win in two fields, and the only person to win in multiple sciences. -
Dmitri Mendeleev
Mendeleev was best known for his work on the periodic table; arranging the 63 known elements into a periodic table based on atomic mass. He arranged elements ascending order of atomic weight, and grouping them by similar properties, and found three yet to be discovered elements. -
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Ernest Rutherford
Ernest had entered Canterburry College in Nelson, New Zealand. He graduated in 1843 with a double first in mathmatics and physical science. -
Period: to
Niels Bohr
Bohr Took up an experiment and theoretical investigation of the surface tension by means of oscillating fluid jets. He also won a nobel prize in physics of 1922. -
JJ Thomson
After other scientist had come to a conclusion that the smallest part particle was an atom of hydrogen, Thomson had found that the smallest part were electrons. He found this out while exploring the properties of cathode rays. -
Period: to
Enrico Fermi
was an Italian theoretical and experimental physicist, best known for his work on the development of Chicago Pile-1, the first nuclear reactor, and for his contributions to the development of quantum theory, nuclear and particle physics, and statistical mechanics -
Marie Curie
Curie and her husband had made the discovery of Polonium and Radium; two whole new elements. These elements are now very important in modern day life because they were the structure to creating x-ray machines. -
JJ Thomson
Thomson won a nobel prize in physics for his research into the discharge of electricity in gases. -
Ernest Rutherford
Rutherford made series of discoveries in fields of radioactivity and nuclear physics. Rutherford discovered alpha and beta rays, set forth the laws of radioactive decay, and identified alpha particles as helium nuclei. -
Hans Geiger
Geiger created a measuring device that had the ability to count the number of alpha particles and other ionizing radiation being emitted. A Geiger counter generally uses a sealed, gas-filled, metal tube that acts as an electrode. A thin wire or needle along the middle of the tube acts as a second electrode, and a voltage is applied to the device such that a current can almost pass through the gas from one electrode to the other. -
Niels Bohr
Bohr created a model of the atom in which the nucleas was in the center and the electrons circled in rings that expanded out from the nucleas. He compared his model with the planets orbiting of the sun. -
Niels Bohr
Contributions: Bohr created a theoretical piece on the absorbtion of alpha rays. -
Enrico Fermi
Fermi is known for creating and building the first nuclear reactor. Nuclear reactors are used at nuclear power plants for generating electricity. Heat from nuclear fission is passed to a working fluid, which runs through turbines.
