Handout # 3 Who's Who in the Development of Atomic Theory • Ancient Egyptians knew of static electricity and electric charge behavior. Like charges repel and opposite charges attract. • Leucippus and Democritus (Greece, approx. 400 BC) First postulated "atoms" as smallest individual unit of pure substance. "atomists" contradicted previous "continuist" theory. Plato and Aristotle were "continuists." • Ben Franklin (approx. 1700's) discovered electricity with kite and lightning. • John Dalton (approx. 1803) an English school teacher, based his atomic theory on what he already knew: Law of Conservation of Mass - Lavoisier, 1796. Law of Definate Proportions - Proust, 1800. Dalton's Law of Multiple Proportions (approx. 1805), CO 2 vs CO Dalton's Atomic Theory • Michael Faraday (approx. 1800's) works with electrolysis. • Henri Becquerel notices phenomenon which Marie Curie later names and characterizes as "radioactivity" (approx. 1800's). Curie wins Nobel Prize for her work. Types of radioactivity:
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