Understanding the theory of atoms.
Created by santinim on Oct 2, 2008
Last updated: 11/03/09 at 01:54 PM
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This British physicist that in a nucleus, besides a proton, is a neutron that has no charge but it's mass is the same as a proton.
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He worked on the first atomic bomb (the Manhattan project) and helped to increase modern knowledge of the structure of the atom.
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Ernest Rutherford found that in the nucleus of an atom was a small particle called a proton and its charge is +1.
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He was an American physicist who stated that the charge of an electron is negative one and the mass is 1/1840 which is also the mass of a hydrogen atom.
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J.J. Thompson came up with the theory that a whole atom is neutral. He said that electrons were negatively charged "plums" in positively charged "pudding".
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He discovered the mysterious, powerful type of radiation called X-Rays. They could pass through certain materials (including skin). The first medical x-ray machine was used in 1896.
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Thompson discovered that the tubes that Crookes discovered were really negatively charged particles, smaller than an atom, which he names "electrons".
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He discovered the early television tube. He called it the cathode ray tube or the "crookes tube". and when they were connected with some sort of voltage, the "rays" glowed while flowing across the tube.
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He was a New Zealander who disproved the "plum pudding model" by the gold foil experiment. While doing so he proved that most of the atom was empty space and that that nucleus was very small and positively charged.
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She was from Poland and won 2 Nobel prizes in her life. She was first to use the word "radiation" to describe the strange energy source that came from some types of atoms also known as radioactive isotopes. She discovered two elements, Radium and Polonium, and was first to use radioactive materials to help treat cancers.
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He was a British schoolteacher who developed the modern atomic theory; all matter is made of atoms, atoms of a particular element are all the same size, mass and chemical properties, atoms can rearrange to form different compounds. He also said that atoms cannot be created or divided into smaller particles but that is no longer true.
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Some call him the "Father of Chemistry". He developed the Law of Conservation of Mass, named Oxygen and Hydrogen, developed the metric system and wrote the first list of elements.
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Alchemists were trying to turn elements into gold. Jabir ibn Hayyan was important because he helped establish experimental design for chemistry.
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The first person that thought of the that matter is made up of tiny particles. In Greek, the word for atoms is atomos meaning it could not be created/destroyed or further divided.
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He believed that matter was either air, fire, or earth, but he was wrong.
http://libertyonline.hypermall.com/Aristotle/aristotle-75.jpg
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