Chemisty

In 1808, John Dalton proposed an explanation for the uprightness of conservation of galvanizing pile, the law of definite proportions, and the law of multiple proportions. He declared that elements were sedate of atoms and that only whole numbers of atoms can link to version compounds. 1. All matter is composed of extremely weensy particles called atoms. 2. Atoms of a given element are identical in size, people, and opposite properties; atoms of antithetical elements differ in size, mass, and other properties. 3. Atoms cannot be subdivided, created, of destroyed. 4. Atoms of different elements combine in simple whole-number ratios to form chemical compounds. 5. In chemical reactions, atoms are combined, separated, or rearranged. In 1897, J.J. Thomson spy the electron. During the affect of discovering the electron, he was able to measure the ratio of the ailment of cathode-ray particles to their mass. He found that this ratio was always the same, regardl ess of the metallic element apply to make the cathode or the nature of the gas privileged the cathode-ray tube. Thomson keep downk that all cathode rays are composed of identical ostracisely charged particles which were later name electrons. In 1904, J.J. Thomson proposed the Plum Pudding Model. In the Plum Pudding Model, the atom is composed of electrons surrounded by a cloud of positive charges to balance out the electrons contradict charges. In 1911, Ernest Rutherford conducted the Gold Foil Experiment. Rutherford along with his associates Hans Geiger and Ernest Marsden bombarded a veer gold foil with fast moving alpha particles. Geiger and Marsden predicted that the mass and charge were uniformly distri preciselyed throughout the atoms of the gold foil so they expected the alpha particles to pass through with only a slight deflection. For a vast majority of the alpha particles, this was the case, only when when the scientists checked for the poss ibility of wide-angle deflections, they we! re shocked to find that 1 in 8000 of the...If you want to get a full essay, friendship it on our website: OrderEssay.net

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