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Thought of the idea of atoms and that they could not be created, destroyed, or further divided.
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Could not believe that the “nothingness” of empty space could exist
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First hospital in North America was built in 1503 in Santo Domingo.
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First car was made in 1939.
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Proposed the the Law of Constant Composition in 1799. This law was very radical at the time and was hotly contested by Claude Berthollet.
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Revised Democritus’s ideas based upon the results of scientific research
Dalton’s Atomic Theory
• All matter is composed of extremely small particles called atoms.
• All atoms of a given element are identical, having the same size, mass, and chemical properties. Atoms of a specific element are different from those of any other element.
• Atoms cannot be created, divided into smaller particles, or destroyed.
• Different atoms combine in simple whole- number ratios to form compounds.
• In -
Proposed what is now known as Avogadro's Hypothesis in 1811. The hypothesis states that at the same temperature and pressure, equal volumes of gases contain the same number of molecules or atoms. When this is combined with Gay-Lussac's Law of Combining Volumes, the only possible formulas for hydrogen, oxygen and water are H2, O2 and H2O, respectively. The solution to the atomic weight problem was at hand in 1811.
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The United States went to battle with our own people.
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Constructed this forerunner of the modern television picture tube to investigate the properties of cathode rays.
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The Horse in Motion was the first movie made.
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The first lightbulb was made.
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While studying the effect of x-rays on photographic film, he discovered some chemicals spontaneously decompose and give off very pentrating rays.
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First to discover the electron.
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Studied uranium and thorium and called their spontaneous decay process "radioactivity". She and her husband Pierre also discovered the radioactive elements polonium and radium.
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Published his famous equation E=mc 2.
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Dealt with the fundamental constituents of the of the universe, the forces they excert on one another, and the results produced by these forces.
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Became a Nobel laureate for his pioneering work in nuclear physics for his theory of the structure of the atom.
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A world wide war.
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Cupid Angling was the first color movie.
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Developed an explanation of atomic structure that underlies regularities of the periodic table of elements. His atomic model had atoms built up of successive orbital shells of electrons.
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Discovered that electrons had a dual nature- similarto both particles and waves. Particle/wave duality. Supported Einstein.
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Described atoms by means of formula connected to the frequencies of spectral lines. Proposed Principle of Indeterminancy- you can not know both the position and velocity of a particle.
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Measured the energy of the protons emerging form the hydrogen atoms.
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The 2nd world wide war.
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First microwave was built.
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J. Presper Eckert and John Mauchly made the first computer company.
