CHEM 135 Chapter Notes - Chapter 1.7: Ernest Rutherford, Henri Becquerel
14 Aug 2016
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1. 7- the structure of the atom: plum pudding model. Small electrons within a sphere of positive charge. Emission of small energetic particles from the core of certain unstable atoms. 3 types of particles: alpha particles (positively charged and the largest particle, beta particles, gamma rays, rutherford"s gold foil experiment. Positively charged alpha particles were directed at a very thin gold sheet of foil. The plum pudding model would have yielded results in which the alpha particles would pass through with minimum deflection. Most alpha particles passed through with little or no deflection, but some were deflected. Hypothesized that matter must contain large regions of empty space with few dense regions of matter. Most of the atom"s mass and it"s positive charge is packed into the nucleus (small core) (99. 9% of the atoms mass) The majority of the atom is empty space in which electrons are dispersed (tiny, negatively charged)
