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500
Alchemists
Alchemists searched for the Philosophers stone, which had thee ability to transform base materials like Copper or lead,into valuable substances like gold. -
Period: 500 to
Timespan
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Oct 10, 600
Democritus
stated that all matter is made up of atoms. -
Oct 10, 700
Aristotle
Provided the method of gathering scientific facts, which proved as the basisfor all scientific work. -
Lavoisier
Provided the formula for the conservation of matter in Chemical reacions, and also distinguished between an alement and a compound. -
Couloumb
Formulated the Couloumb's law, which states that the force between two electrical charges is proportional to the product of the charges and inversity proportional to the square of the distance between them. -
John Dalton
Formed the atomic theory,which states that all matter is composed of tiny,indestructable particles called atoms that are all alike and have the same atomic weight. -
Crookes
Created the Crookes tube and demonstrated that cathode rays travel in straight lines and produce phosphorence and heat when they strike certain materials. -
W.K Roentgen
Discovered X-Rays whuile expermenting with cathode-ray tubes. -
Becquerel
Discovered radioactivity when he investigated uranium and other radioactive substances. -
The Curies
Discovered radium and polonium when they started to investigate radioactive substances -
J.J Thomson
Discovered the electron and developed the plum pudding model of the atom -
Max Planck
Originated the quantum theory -
Albert Einstein
Postlate that light was made up of different paticles that, in addition to wavelike behavior, demonstrate certain properties unique to particles. He also brought forth the theory of relativity -
Robert Millikan
Found out the electric charge of the electron -
Ernest Rutherford
Used the result of his gold foil experiment to state that all the mass of an atom were in a small positively charged ball at the center of the atom. -
Neils Bohr
Stated that the electrons moved around the nucleus in successively large orbits. He also preseted the Bohr atomic model which stated that atoms absorb or emit radiation oly when the electrons abruptly jump between allowed, or stationary states. -
Geiger
Introduced the first detector of alpha particles and other radiations. -
Erwin Shroedinger
Introduced the Shroedinger equation, a wave equation that describes the form of the probability waves that govern the motion of small particles and how these waves are altered by external influences. -
Chadwick
Discovered the neutrally charged neutron -
Otto Hahn
Discovered nuclear fission, in which the nucleus of an atom breaks up into two seperate nuclei, while experimenting with uranium -
Lise Meitner
Worked with Auto Hahn to discover uranium fission -
Glen T. Seaborg
Isolated and idenified elements heavier than Uranim, and in the process added elements number 94-102, and 106 -
Murray Gell-Mann and George Zweig
Brought forth the idea of "quarks", little bits of matter which when used kind of like building blocks, serve to explian some complex chemical substances