-
1700 BCE
King Hammurabi's reign over Babylon
metals were found. it was recorded and listed in conjunction with heavenly bodies. -
13
Failure of the Gold Business
Pope John XXII (the pope at the time) issued an edict against gold-making, it continues despite the lack of good metals to make gold out of it. the materials they had were cheap metals to make gold out of it. the heap metals never worked and gold never happened. -
1520
Elixir of Life
Alchemists not only wanted to convert metals to gold, but they also wanted to find a chemical concoction that would enable people to live longer and cure all ailments. this never happened. -
Death of Alchemy
The disproving of Aristotle's four-elements theory. the book, the skeptical chemist combined to destroy this early form of chemistry. -
Dalton's Atomic Theory
John Dalton publishes his Atomic Theory which states that all matter is composed of atoms, which are small and indivisible. -
The Proton
Eugene Goldstein discovered positive particles by using a tube filled with hydrogen gas. The positive particle had a charged opposite to the electron. It also had a mass of 1.66E-24 grams or one atomic mass unit. The positive particle was named the proton. -
X-rays
Wilhelm Roentgen accidentally discovered x-rays while researching the glow produced by cathode rays. Roentgen performed his research on cathode rays within a dark room and during his research, he noticed that a bottle of barium platinocyanide was glowing on a shelf. -
Pitchblende
Henri Becquerel was studying the fluorescence of pitchblende when he discovered a property of the pitchblende compound. Pitchblende gave a fluorescent light with or without the aid of sunlight. -
Vacuum Tube
John Ambrose Fleming creates the first vacuum tube. -
Period: to
Manhattan Project
Albert Einstein and Enrico Fermi both warned the United States about Germany's extensive research on atomic fission reaction. the United States developed the very first working nuclear fission reactor. The Manhattan Project was in process.
