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1、Atomic Model TimelineAtomic Model Timeline400BC400BC DemocritusDemocritusDemocritus found that atoms are not all the same, Democritus found that atoms are not all the same, they are eternal, and always moving. He made a they are eternal, and always moving. He made a theory on this to explain why and
2、 how atoms theory on this to explain why and how atoms were so small, and what they were about. He were so small, and what they were about. He proposed a more advance atomic theory. proposed a more advance atomic theory. http:/ ish400BC ish Indivisible, Solid Sphere ModelIndivisible, Solid Sphere Mo
3、delDeveloped by Democritus. He said all matter is composed of indivisible tiny things made up into small not being able to be seen by the eye structures.384-322BC384-322BC Aristotle and fellow GreeksAristotle and fellow GreeksHe found that matter is made of atoms. He also He found that matter is mad
4、e of atoms. He also found that matter will always exist. He also found found that matter will always exist. He also found 4 elements, fire, water, earth, and air. With all 4 elements, fire, water, earth, and air. With all this, he came up with the theory of motion. this, he came up with the theory o
5、f motion. http:/ AlchemistsAlchemistsNow, they wanted to live forever, so they started Now, they wanted to live forever, so they started out with trying to make a potion that could make out with trying to make a potion that could make them live forever. They didnt succeed, but they them live forever
6、. They didnt succeed, but they did make many experiments, and the scientific did make many experiments, and the scientific method. They also kept careful records.method. They also kept careful records.17771777 Antoine LavoisierAntoine LavoisierHe had the first version of the Law of He had the first
7、version of the Law of Conservation of Matter. He also named oxygen Conservation of Matter. He also named oxygen and hydrogen. He invented the first periodic and hydrogen. He invented the first periodic table, which had 33 elements.table, which had 33 elements.http:/ Charles Augustin de CoulombCharle
8、s Augustin de CoulombHe had the theory of Simple Machines. He also had He had the theory of Simple Machines. He also had Coulombs law which stated the interaction between Coulombs law which stated the interaction between electric charges. He also published the laws of friction. electric charges. He
9、also published the laws of friction. He used windmills and the elasticity of fibers and metals He used windmills and the elasticity of fibers and metals to come up with this law.to come up with this law.http:/www.bhak-bludenz.ac.at/physik/geschichte/physiker/bilder/coulomb.jpg18031803 John DaltonJoh
10、n DaltonHe proposed the atomic theory. He inferred proportions of elements He proposed the atomic theory. He inferred proportions of elements in compounds. He found the atomic weight, and chemical symbols. in compounds. He found the atomic weight, and chemical symbols. He also had the most useful at
11、omic theory of matter. To come up He also had the most useful atomic theory of matter. To come up with this, he tested gases and used evaporation to find out what the with this, he tested gases and used evaporation to find out what the gases had on that mixture all together. gases had on that mixtur
12、e all together. http:/redescolar.ilce.edu.mx/redescolar/efemerides/septiembre2001/interna/dalton.gif18791879 Sir William CrookesSir William CrookesHe came up with thallium and helium. He He came up with thallium and helium. He investigated canal rays, cathode rays, and investigated canal rays, catho
13、de rays, and plasmas. He used electricity in gases, and found plasmas. He used electricity in gases, and found as the pressure went down, the electrodes as the pressure went down, the electrodes began to emit rays.began to emit rays.http:/ BecquerelBecquerelHe came up with radioactivity. He found th
14、is out from He came up with radioactivity. He found this out from unknown x-rays waves, which were produced by unknown x-rays waves, which were produced by uranium. Penetrating radiation was also discovered by uranium. Penetrating radiation was also discovered by Becquerel. He also discovered that u
15、ranium was able to Becquerel. He also discovered that uranium was able to expose a photographic plate on black paper, and didnt expose a photographic plate on black paper, and didnt depend on the chemical state. depend on the chemical state. http:/dbhs.wvusd.k12.ca.us/webdocs/Gallery/Becquerel.GIF18951895 W.K. RoentgenW.K. RoentgenHe discovered x-rays when he was working with Sir William He discovered x-rays when he was working with Sir William Crookes tube. He also found that x-rays pass through Crookes tube. He al
