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Atomic Structure

Atomic Structure. A brief summary. Models of The Atom. The Dalton Model (1810) Atoms are hard spheres( i.e. marbles or grains of sand) Didn’t explain: how atoms stick together (bonds) how atoms of each element are different. Models of The Atom. The Plum Pudding Model

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Atomic Structure

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  1. Atomic Structure A brief summary

  2. Models of The Atom The Dalton Model (1810) • Atoms are hard spheres( i.e. marbles or grains of sand) Didn’t explain: • how atoms stick together (bonds) • how atoms of each element are different

  3. Models of The Atom The Plum Pudding Model • Proposed by J.J.Thomson (~1897) • Atoms contained negatively-charged particles called corpuscles which were embedded in a sphere of positive charge • Atoms were mostly empty space

  4. Thomson’s experiment

  5. Models of The Atom Rutherford Model (aka: nuclear model) ~1911 • The nucleus, which is at the center of the atom, contains protons (positively charged) and all of the atom’s mass • Electrons move around the nucleus.

  6. Rutherford’s ExperimentAlpha particle scattering experiment

  7. Rutherford’s experiment (b) Actual results (a) The results that the metal foil experiment would have yielded if the plum pudding model had been correct

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