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in 322-384 b.c he was able to gain wide acceptance for his idea on nature
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was the first person to propose the idea that matter was not infinitely divisble in 460-370 b.c
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Based on his studies on copper carbonate reactions, Proust discovered that each pure compound has its own characteristic elemental composition
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revived and revised Democritus’s ideas based upon the results of
scientific research he conducted. -
states that equal volumes of gases, at the same temperature and pressure, contain the same number of molecules. Avogadro's hypothesis wasn't generally accepted until after 1858 (after Avogadro's death), when the Italian chemist Stanislao Cannizzaro was able to explain why there were some organic chemical exceptions to Avogadro's hypothesis.
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compiled a list of elements known at the time
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he heated a mixture of rubber and sulfur creating the rubber for tires
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is known for his discovery of radioactivity
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began a series of cathode ray tube experiments
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His study of the phenomenon led him to a startling conclusion: matter can gain or lose energy only in small, specific amountscalled quante
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determined the charge of an electron
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he was interested in studying how positively charged
alpha particles (radioactive particles you will learn more about later in this
chapter) interacted with solid matter -
discovered that atoms of each element contain a uniquepositive charge in their nuclei
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furthered the wave-particle theory proposed by de Broglie. Schrödinger derived an equation that treated the hydrogen atom’s electron as a wave
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showed that the nucleus also contained another subatomic particle, a neutral particle called the neutron
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De Broglie had been thinking that Bohr’s quantized electron orbits had characteristics similar to those of waves
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discovered the cathode ray led to the invention of one of the most important technological and social developments of
the 20th century—the television. -
discovered the radioactive substances of radium and polonium
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a contemporary of de Broglie, proved to have profound implications for atomic models.
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proposed in 1905 that electromagnetic radiation has both wavelike and particlelike natures
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proposed a quantum model for the hydrogen atom that seemed to answer this question.
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hat weight was conserved through the course of chemical reactions even those involving gases
