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Period: 100 to
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460
Democritus
he discovered the atom. -
Antonie Lavosier
He changed the science from a qualitative to a quantitative one. Lavoisier is most noted for his discovery of the role oxygen plays in combustion. -
Joseph Proust
He proved that the relative quantities of any pure chemical compound’s constituent elements remain invariant, regardless of the compound’s source. This is known as Proust’s law, or the law of definite proportions -
John Dalton
He is know for developing the ancient concept of atoms into a scientific theory that has become a foundation of modern chemistry. -
Amadeo Avagadro
He hypothesized that equal volumes of gases at the same temperature and pressure contain equal numbers of molecules. -
George Washington Died
George Washington Died at His Mount Vernon Home December 14, 1799. -
William Crooks
He discovered the element thallium and cathode-ray studies, fundamental in the development of atomic physics. -
J.J. Thomson
He Discovered the electron. He suggested a model of the atom as a sphere of positive matter in which electrons are positioned by electrostatic forces. -
Max Planck
He orginiated the quantive theory. It affected the 20 th centry and all the science work. -
Civil War
The north and the south fought over slavery. -
Assassination of Abraham Lincoln
John Wilkes Booth, a famous actor and Confederate sympathizer, fatally shot President Abraham Lincoln at Ford's Theatre in Washington. -
Robert Millikan
His discoveries in Brownian movements in gases put an end to all opposition to the atomic and kinetic theories of matter. -
Ernest Rutherford
He postulated the nuclear structure of the atom: experiments done in Rutherford's laboratory showed that when alpha particles are fired into gas atoms, a few are violently deflected, which implies a dense, positively charged central region containing most of the atomic mass. -
Erwin Schrodinger
Schrödinger's work in quantum theory resulted in the creation of a new scientific discipline. This equation and the later relativistic versions are considered by many scientists to have the same central importance to molecular quantum mechanics as Newton's laws of motion have to large-scale classical mechanics. -
Henery Moseley
Henry Moseley developed the application of X-ray spectra to study atomic structure. -
Lous de Broglie
His ideas were a basis for developing the wave mechanics theory. This theory has greatly improved our knowledge of the physical nature on the atomic scale. -
Henri Becquerel
Becquerel accidentally discovered that phosphorescent uranium salts, even when not exposed to light, produced spontaneous emissions that darkened photographic plates. -
Madame Curie
She discovered the radioactive substances of radium and polonium. She was the first to isolate pure radium, and was world renowned as the leading expert on radiation. -
Albert Einstein
His development of the theory of relativity, and his influence on the development of the nuclear bomb are what made him known forh is work in chemistry. -
World War 1
The Central Powers faced off against the Allied powers. -
World War 2
The countries of the world aligned with either the Axis powers or the Allies and battled in a total war. -
Perl Harbor
The attack on Pearl Harbor was a surprise military strike conducted by the Imperial Japanese Navy against the United States naval base at Pearl Harbor. -
Holocaust
The Holocaust was the systematic, bureaucratic, state-sponsored persecution and murder of approximately six million Jews by the Nazis. -
Assassination of JFK
President John F. Kennedy was assassinated as he rode in a motorcade through Dealey Plaza in downtown Dallas. -
Watergate Breakin
Five men, one of whom says he used to work for the CIA, are arrested at 2:30 a.m. trying to bug the offices of the Democratic National Committee at the Watergate hotel and office complex. -
civil War
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World War 1
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Assassination of JFK
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Titanic
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Pearl Harbor- Video
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Aristotle
He discovered the 3 elements, solids, Liquid gas, and plasma.
