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Jan 1, 1000
Alchemists 500 BC
Discovered a substance that would transmute the more
common metals into gold or silver, and to finding a means of
human life. -
Jan 2, 1000
Democritus 460 BC
He came up with the Small, Spherical, Solid, indvisible model of an atom. -
Jan 3, 1000
Aristotle 384 BC
Developed methods for the gathering of scientific fact.
His work provided the basis for scientific work more than a
millenium. -
Jan 4, 1000
Small spherival solid indivisible model 400BC
Democritus created this because he thought the world was made up of empty space and an infinate amount of atoms. -
Jan 5, 1000
Rise of Greek Cities 800BC
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Charles Augustin de Coulomb
Created the Coulomb's Law which is the force one timy charged object
forces on a second one is proportional to the amount of
charge on one times the amount of charge on the others. -
Antoine Lavoisier
Antoine proved the conservation of matter
and explained the mysteries of fire. -
John Dalton
In 1808, he came up with the Dalton's Atomic Theory, elements are made up of tiny particles called Atoms. All atoms of a given element are identical. The atoms of a given element are different from those of any other element compounds and chemical reactions. -
Wilhelm C. Rosentgen
Wilhelm discovered x-rays in 1895, also created the first "rontgenogram" of his wife's hand and ring. -
Irish Potato Famine
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Henri Becquerel
Henri discovered that rays emitted by Uranium causes gases to ionize and that they differed from xrays in that they could be deflected by electric magnetic fields. -
JJ Thomson
JJ discovered a method for separating different kinds of atoms and molecules by the use of positive rays in 1904. He also did the original study of Cathode rays culminating in the discovery of the electron in 1897. -
Max Planck
1900 he stated that radiation is quantized. -
Marie Curie
Marie Curie discovered Radium that gives the materials a constant source of energy through radiation, and that glow is continuous. She reasoned that this is because of the charged particles that it gives off (ionizing the air). Geigher-Mueller Tube uses to detect radiation -
Robert Millikan
Robert created the "falling-drop method" which demostrated atomic structure of electricity in 1910.
He also made the fisrt direct photoelectric determination of Planck's constant h between the years 1912 to 1915 -
Ernest Rutherford
Ernest invented the dector for electromagnetic waves. -
Albert Einstein
1905-Proposed the quantum of light in which he states that light
behaves like a particle but also has a wave nature, giving it
a dual nature -
Neils Bohr
Neils Bohr created the Bohr model of the hydrogen atom (1907) that represents the electron as restricted to certain circular orbits around the nucleus. -
Erwin Schrodinger
Erwin discovered the Schrodingers wave equation in 1926 -
James Chadwick
Discovered that the nuclei of most atoms contatin neutrons as well as protons. -
Werner Heisenberg
Werner came up with the theory of quantum mechanics in 1925, which resulted discovery of allotropic forms of hydrogen. -
Plum Pudding model
This was proposed by JJ Thomson. These electrons must have been balanced by some sort of positive charge. The distribution of charge and mass in the atom was unknown therefore JJ created a model representing the positive and negative charge filling a sphere. -
Planetary Model
Or also known as the Bohr model. This was to show how many electrons, neutrons and protons are in each atom. -
World War I
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Rutherford-Bohr Model
The Bohr Model is a modification of the earlier Rutherford Model, some people call Bohr's Model the Rutherford-Bohr Model. It is an explaination of an atom consisting of a small, positively-charged nucleus orbited by negatively-charged electrons. -
Electron Cloud Model
Erwin Schrodinger created this model as the electron moves it leaves a trace of where it was. The collection of traces quickly begins to resemble a cloud. -
George Zweig
Worked with Murray Gell-Mann and suggested the idea of quarks called up, down, or strange, composed of mesons and baryons.
