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Chapter 4- Section 1: The Development of the Atomic Theory Cut and paste the pictures provided that relates to each scientist/theorist: Scientist/Theorist Democritus Dalton Thomson Rutherford Bohr Picture of Model Description of Model No picture needed. Paste in description column Instead. *Proposed that atoms exist and called them “atomos.” *Proposed that these atomos were eternal and can’t be divided *He had not scientific evidence to support theory *Evidence found through experimentation *Proposed that atoms cannot be divided, all atoms on an element are similar, and elements can combine to form compounds. *Proposed atoms were tiny spheres. *Performed experiments to suggest atoms could be divided. *Used cathode rays to discover electrons. *Proposed the plum pudding model. *Performed experiments to determine structure of atom: he shot alpha particles (+ charge) at gold foil and found two things: 1. Atoms have a lot of empty space. 2. Atoms have a positively charged center (nucleus) *Proposed a model that had nucleus in center of atom with electrons orbiting around the outside. *Proposed planetary model of atom in which the energy of the electron is related to its path around the nucleus. Model of the Atom 1. All matter consists of invisible particles called atoms. 2. Atoms are indestructible. 3. Atoms are solid but invisible. 4. Atoms are homogenous. 5. Atoms differ in size, shape, mass, position, and arrangement.