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History of the Atomic Modle
Transcript of History of the Atomic Modle
Aristotle in 300 BC announced the element: Air, Water, Earth, and Fire
He declared that all matter is made of these four elements, and he declared matter had properties: Dry, Wet, Cold, Hot.
In 300 - 380 BC, Alchemist attempted to transmute metals into gold. Believed Aristotle that all elements had four properties. They attempted this by using the Philosophers stone
In the 1700ss Charles Coulomb discovered that given two particles separated by a certain distance, the force of repulsion or attraction is promotional to product of the two charges and is inversely proportional to the distance of the charges.
In 1803, John Dalton published his atomic theory that matter is composed of atoms and atoms are small and cannot be seen by humans.
Robert Miliken, in 1909 found the mass of an electron by putting charged oil droplets into an electrically charged field. He found the charge of an electron was 1.602 E-19 coulomb. He also discovered the mass of an electron to be 9.11 E-28 grams by using Thompson's mass ratio. Miliken received a Noble Prize in 1932 for physics.
History of the Atomic Model
By Ethan Dennett & Anika Kale
In 430 BC, Democritus states that the simplest form of matter is an atom and all matter is made of atoms.
Marie Curie discovered the first radioactive elements ( uranium and thorium) in 1897. She also discovered radium and polonium. All these elements in pitchblend. She is the only person to earn two Nobel Prizes and the first woman to been awarded one.
Ernest Rutherford, in 1912, experimented with radioactive elements. He sent a radioactive source through a magnetic field, some of the radioactivity was deflected into the positive plate, some was deflected into the negative plate, and the rest went through the field. He concluded there was 3 types of radioactivity; alpha and beta particles, and gamma rays. Rutherford created an atomic model that was mostly empty space that we use today.
Created the Geiger counter in 1906. It measured the alpha particles in the air by making sounds.
Discovered the neutron in 1932, it measured slightly heavier the proton and had no charge.
In 1905, Eienstein came up with the equation e=mc2 stating that energy is equal to mass times speed squared. Also, Eienstein informed the USA about Germany's research on atomic fission, and helped developed the first working nuclear reactor under the University of Chicago.
In 1896, Becquerel discovered the property of pitchblend compound as he was studying the fluorescent light of it. Pitchblend gave off a fluorescent light without the added help of sunlight.
William Crookes discovered cathode rays by using a vacuum tube containing a zinc sulphide coating on one end and a metal cathode embedded on the other end, and a metal anode cross in the middle. The rays emitted caused the zinc sulphide to glow and Crookes called these cathode rays.