1. THE HISTORICAL DEVELOPMENT of ATOMS 2. Early Greek Theories 400 B.C. - Democritus thought matter could not be divided indefinitely. 350 B.C - Aristotle modified an earlier…

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Slide 1 History of Atomic Theory Slide 2 Scientists B.C. DemocritusAristotle 384-322 BC Believed matter is continuous 400 BC Coined the term “atom” Slide 3 Dalton’s…

Slide 1 Ch 4 – Atomic Structure History: 1.Democritus- (400 BC) What’s the smallest possible particle? Break a rock into pieces… eventually get to smallest possible…

Chapter 28 Nuclear Chemistry Radioactivity Chemical reactions occur in order for atoms to form stable electron configurations. Nuclear reactions occur because unstable isotopes…

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Slide 1 Ch 4 – Atomic Structure History: Democritus- (400 BC) What’s the smallest possible particle? Break a rock into pieces… eventually get to smallest possible pieces…

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The Atom, in a nutshell⦠Democritus (c. 460â370 BC) John Dalton (1766â1844) J.J. Thomson (1856â1940) Identified the electron using cathode ray tube, determined negative…