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In 460 B.C. Democritus created many theories. Some were matter is composed of empty space through which atoms move; atoms are solid, homogenous, indestructible, and indivisible; different kinds of atoms have different sizes and shapes.
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Aristotle was born in 384 B.C. Aristotle rejected the atomic theory of Democritus entirely because it did not agree with his own ideas on nature. He didn't believe that the "nothingness" of empty space could exist. He was able to gain acceptance of his ideas on nature- those ideas were not challenged for the next 2,000 years.
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The Pilgrims coming from Europe landed on America when they were trying to find a new land and a place to start over with their new lives.
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On this date in 1732, the great man of George Washington was born and later became our first President and one of our Founding Fathers of the United States of America.
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The American Revolutionary War faught against the new Americas and Britian ended after the Treaty of Paris was signed.
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Antoine LavosierAntoine complied a list of elements that were known at that time. The list contained 23 elements.
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John DaltonHis theories were 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.
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Joesph was a chemical annalist and was the one who created the Law of Definite Proportions that states that the proportion by the masses of two elements would always remain the same.
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Amadeo determined that the volume of one mole of a gas. His number is extremely small and is used to count extremely small particles.
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Iowa was granted statehood on this day in 1846.
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William noticed a flash of light in a tube, that flash was produced by some form of radiation striking a light-producing coating that had been applied to the end of the tube. His further work showed that there were rays of radiation traveling from the cathode to the anode within the tube, because of the ray of radiation orginated from the cathode end of the tube, it became to be known as a cathode ray.
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Christopher invented the new and improved typewriter. He wanted a machine that printed letters. He improved the previous typewriter by Alfred Ely Beach.
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Henri was studying minerals that emit light after being exposed to sunlight, a phenomenon called phosphorescence. He accidentally discovered that phoshorescent uranium salts- even when not exposed to light - produced spontaneous emissions that darkened photographic plates.
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J.J. Thomson was the first to discover the electron.
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Marie and her husband took Becquerel's mineral sample and isolated the components emitting the rays. They concluded that the darkening of the photographic plates was die to rays emitted specifically from the uranium atoms present in the mineral sample. They named the process by which materials give off such rays radioactivity; the rays and particles emitted by a radioactive source are called radiation.
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Ernest discovered that the atom was not the smallest unit of mass. He discovered that atoms contained a nucleus, that was made of protons.
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Max's study of the phenomenon led him to a startling conclusion: matter can gain or lose energy only in small, specific amounts called a quanta. A quantum is the minimum amount of energy that can be gained or lost by an atom.
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The first AI was done by a Russian scientist E.I. Ivanoff. He did this with cattle, horses, birds, and sheep. He recorded his first successful one in cattle.
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The very famous Albert Einstein even had his fame in chemistry. He had a theory that the electromagnet radiation has both wavelike and particlelike natures. That is, while a beam of light has many wavelike characteristics, it also can be thought of as a stream of tiny particles, or bundles of energy photons.
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Robert MillikanRobert was the first to determine the charge of an electron. He calculated the mass of a single electron. He also proposed a model of the atom known as the plum pudding model.
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Neils Bohr correctly predicted the frequencies of the lines in hydrogen's atomic emission spectrum.
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In 1913, Henry Ford installed the first moving assembly line for the mass production of an entire automobile. His innovation reduced the time it took to build a car from more than 12 hours to just 30 minutes.
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Henry MoseleyHenry discovered that atoms of each element contain a unique positive charge in their nuclei. The number of protons in an atom identifies it as an atom of a particular element.
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Louis proposed an idea that eventually accounted for the fixed energy levels of Bohr's model.
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Erwin furthered the wave-particle theory proposed by deBroglie. He derived an equation that treated the hydrogen atom's electron as a wave.
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Werner HeisenbergWerner developed the Heisenberg Uncertainty Principle. It is a fundamental principle on which quantum mechanics is based on.
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The National FFA Organization begun in Kansas City, Mo. At this time it was called Future Farmers of America. No women or African Americans were allowed in at this time.
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James Chadwick was Rutherford's coworker showed that the nucleus alao contained another subatomic particle, a neutral particle called the neutron.
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Germany attacked Poland on this date in 1939. However, no one wanted a war but Germany being ruthless attacked anyway.
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On this day was a tragic day in the U.S., the Twin Towers were attacked by two planes that were hijackers that were apart of the Taliban. 3 planes total were hijacked, the third one crashed on its way to another destination. Our nation is still trying to recover from this tragedy.
