Chemisty

In 1808, John Dalton proposed an explanation for the uprightness of conservation of galvanising pile, the law of definite proportions, and the law of multiple proportions. He stated that elements were sedate of atoms and that only whole numbers of atoms can blend in to version compounds. 1. All matter is composed of extremely down in the mouth particles called atoms. 2. Atoms of a given element are identical in size, band, 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 ascertained the electron. During the affect of discovering the electron, he was able to measure the ratio of the commission of cathode-ray particles to their mass. He found that this ratio was alw ays the same, regardless of the metallic element apply to make the cathode or the nature of the gas inner(a) the cathode-ray tube. Thomson keep downk that all cathode rays are composed of identical ostracisely supercharged 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 prohibit charges. In 1911, Ernest Rutherford conducted the Gold Foil Experiment. Rutherford along with his associates Hans Geiger and Ernest Marsden bombarded a stretch gold foil with fast moving alpha particles. G eiger and Marsden predicted that the mass an! d 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, that when the scientists checked for the possibility of wide-angle deflections, they were shocked to find that 1 in 8000 of the...If you want to get a full essay, nine it on our website: OrderEssay.net

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