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John dalton
Main year of contribution : 1803
Contribution : Published his own gas law (Dalton's law). The law specified that the total pressure applied by a gaseous mixture is the same as the amount of the partial pressures of each single part in a gas mixture. He worked out the atomic weights of hydrogen, oxygen, Nitrogen, Carbon, Sulfur and Phospherus and put them in a table. -
J.J. Thomson
Main year of contribution: 1897
Contribution: Showed that the cathode rays tradiated when they were released in a low pressure glass tube when a voltage was put on in the space seperating two metal plates had consisted of particles and electrons that carried electricty. -
Marie curie
Main year of contribution: 1911
Contribution: She invented a number of methods for the disconection of radium from radioactive residues in satisfactory amounts to allow for it's depiction and the attentive study of it's features especially it's healing features. -
Henry mosely
Main year of contribution : 1913
Contribution : Henry discovered a structured connection between wavelength and atomic number (moseleys law). He also said that there were a number of missing elements and periodic numbers in the periodic table. His procedure for x-ray crystallography sorted out many chemical problems, But they confused chemists for an amount of years. -
Niels bohr
Main year of contribution: 1913
Contribution: He put forward a theory for the hydrogen atom based on qauntum theory that energy is moved only in particular carefully determined amounts. His theory could quite possibly explain why atoms release light in fixed wavelengths. -
Francis aston
Main year of contribution : 1919
Contribution : Attacked the difficulty of the seperation of the isotopes of neon. Invented the mass spectograph which gave him alot of success. The mass spectograph was equiptment in which the inventive use of electromagnetic focusing allowed him to make use of the very small dissimilairity of the two isotopes in mass. -
ernerst rutherford
Main year of contribution: 1919
Contribution: Discovered that the nuclei of particular light elements (nitrogen) could break apart because of the effect of energetic alpha particles that came from a source that was radioactive and that throughout the process fast protons were released. -
Erwin schrodinginger
Main year of contribution : 1926
Contribution : He established a new system of mechanics. It was a further devolopment of Niel bohrs theory. Niel thery was a good description but didn't attend to the more complicated atoms and molecules. Erwin devised a wave sum that gave the correct energy levels of atoms. -
James chadwick
Main year of contribution : 1932
Contribution : James show that the reaction of a past experiment was incorrect . He was able to show that in the reaction a neutral particle with a mass the same size as a proton was released. The particles was than discovered and it was named neutron. -
Murray Gell-Mann
Main year of contribution : 1950's and 60's
Contribution : He castegorized the elementary particles and their interaction. He suggested that observed particles are actually combined. They are made up by building blocks (quarks) that are smaller. Because of this thoeory we believe that new particled are existant and when they were found later on the theory was accepted.
