1. History of the Atom
Block 2 - Downey

2. Democritus
Said that things in this world were made of “uncuttable” particles called “atomos”
Drawing – “Not yet formed. Only the idea of an invisible particle was created.”

3. Dalton
Proposed a model of the atom in which the individual atoms were thought of as tiny solids like balls or marbles
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4. Thomson
Saw the atom has a positively charged sphere with negative particles (electrons) embedded within
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5. Rutherford
Saw the atom as mostly empty space with electrons orbiting around a small, dense nucleus
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6. Bohr
Proposed a model of the atom in which the atom was a positively charged sphere with negatively charged electrons orbiting in specific layers or shells
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7. Heisenberg and Schrodinger
Created the atomic model that has a positively charged nucleus and a negatively charged cloud of electrons giving the atom its size
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