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Jan 1, 1000
Aristotle
in 322-384 b.c he was able to gain wide acceptance for his idea on nature -
Jan 1, 1000
Democritus
was the first person to propose the idea that matter was not infinitely divisble in 460-370 b.c -
joseph proust
Based on his studies on copper carbonate reactions, Proust discovered that each pure compound has its own characteristic elemental composition -
John dalton
revived and revised Democritus’s ideas based upon the results of
scientific research he conducted. -
amadeo avagadro
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. -
Antoine Lavoisier
compiled a list of elements known at the time -
Charles Goodyear
he heated a mixture of rubber and sulfur creating the rubber for tires -
henri Antoine
is known for his discovery of radioactivity -
J.J Thomson
began a series of cathode ray tube experiments -
Max Planck
His study of the phenomenon led him to a startling conclusion: matter can gain or lose energy only in small, specific amountscalled quante -
Robert Millikan
determined the charge of an electron -
Ernest Rutherford
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 -
Henry Mosele
discovered that atoms of each element contain a uniquepositive charge in their nuclei -
ErwinSchrödinger
furthered the wave-particle theory proposed by de Broglie. Schrödinger derived an equation that treated the hydrogen atom’s electron as a wave -
James Chadwick
showed that the nucleus also contained another subatomic particle, a neutral particle called the neutron -
Louis de Broglie
De Broglie had been thinking that Bohr’s quantized electron orbits had characteristics similar to those of waves -
william Crookes
discovered the cathode ray led to the invention of one of the most important technological and social developments of
the 20th century—the television. -
madama curie
discovered the radioactive substances of radium and polonium -
Werner Heisenber
a contemporary of de Broglie, proved to have profound implications for atomic models. -
Albert Einstein
proposed in 1905 that electromagnetic radiation has both wavelike and particlelike natures -
Niels Bohr
proposed a quantum model for the hydrogen atom that seemed to answer this question. -
Antoine Lavoisier
hat weight was conserved through the course of chemical reactions even those involving gases
