CHEM 1R03 Lecture Notes - Chlorate, Dinitrogen Tetroxide, Molar Mass
13 Feb 2013
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Make up all matter are made of protons (+), neutrons and electrons (-) electrons are ridiculously small and light compared to protons. Jj thompson (1890s) demonstrated that an atom has negative parts- electrons- and thus counter- discovered that there must be a positive part since the whole thing is neutral. Thompson- cathode shoots out electrons; using magnets, electrons bent towards the positive and away from the negative magnets. Video film films at a different speed than the electrons move through a screen to create a picture. William thompson (lord kelvin- kelvin scale) responsible for plum pudding model. He noticed it was concentrated in the centre. His model is a nucleus with electrons orbiting it. Discovery of neutrons: bohr uses emission spectra of hydrogen to mathematically describe the energy given off by hydrogen when excited. Bohr-rutherford model= electrons moving in set orbits around the nucleus, each orbit w a set #
