Atomic Structure A brief summary.

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Presentation transcript:

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 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

Thomson’s experiment

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.

Rutherford’s Experiment Alpha particle scattering experiment

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