Scientists' Theories and Experiments of the Atom

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Joseph Proust's discoveries

1780 - 1794

Joseph gives his research about the elements by developing hydrogen sulfide as a regent and converted his analysis of chemicals into percentage weights.
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John Dalton's Discoveries

1787 - 1844

John's view of atomism comes in by hypothesizing that different gases had different volumes and surrounds of caloric and calculated his atomic weights into percentage compositions of compounds.
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Amedeo Avogadro's theory

1811

Amedeo hypothesized that gases with the same volumes and the same amounts of pressure and temperature had the same amount of molocules.
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Dmitri Mendeleev's creation of the Periodic Table

1869

Marie Curie's use of Radium

1898 - 1934

After discovering Radium in the study of radioactivity, Marie decided to use it for medical reasons throughout her life.
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Earnest Rutherford's thoron discovery

1898

Earnest Rutherford discovered a new noble gas, which came to be thoron.

JJ Thomson's hypothesis and discovery

1904

JJ went to America to give lectures of electricity and matter in Yale. Some of the lectures gave suggestions of an atom's structure. He also found a way to seperate different atoms and molecules.
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Earnest Rutherford's nucleus concept

1910

By investigating the scattering of alpha rays and the inner structure of the atom caused Earnest to come up with a concept of the nucleus.
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Hans Geiger's proposal

1912

Hans, with his Geiger counter and experiments, came to the conclusion that the nucleus had a small volume in the center of an atom.
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Niels 's Study

1913

Niels had published his study of the structure of the atom with Rutherford's discovery of the atom's nucleus, suggested that electrons jump between energy levels, and believed that electrons went around in orbits.
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Enrico Fermi's Discovery of Secondary Neutrons

1939

With the discovery of fission, Enrico thought of secondary neutrons as well as the chain reaction and experimented until he created the first controlled nuclear chain reaction.
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Scientist personal information

Joseph Proust dies

1826

John Dalton dies

1844

Amedeo Avogadro dies

1856

Dmitri Mendeleev dies

1907

Marie Curie dies

1934

Earnest Rutherford dies

1937

JJ Thomson dies

1940

Hans Geiger dies

1945

Enrico Fermi dies

1954

Niels Bohr dies

1962