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Leucippus of Abdera, the philosopher, conceives of the atomic universe. His pupil is Democritus.
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He became the first person to experiment with the atom
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John Dalton was born September 6, 1766 in the United Kingdom.
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The Law of Conservation of Mass was founded by Antoine Laurent Lavoisier. It states that in a chemical reaction, matter is neither created nor destroyed
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Dalton developed the law of multiple proportions. It states "'When two elements combine with each other to form two or more compounds, the ratios of the masses of one element that combines with the fixed mass of the other are simple whole numbers'.
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J.J. Thomson was born December 18,1856 in Cheetham, Manchester.
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Max Planck was born April 23, 1858
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Robert Andrews Millikan was born on the 22nd of March, 1868, in Morrison, Illinois.
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Ernest Rutherford was born August 30, 1871 in Nelson, New Zealand
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Marie Curie was born November 7, 1867.
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Albert Einstein was born March 14,1879 in Ulm , Germany.
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Erwin Schrodinger was born August 12, 1887 in Vienna
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Louis De Broglie was born August 15,1892 in Dieppe, France.
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j.j. discovered the electrons ( particles which are smaller than atoms and which have a negative charge )
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Curie discovered polonium and radium. She deduced that radioactivity does not depend on how atoms are arranged into molecules, but rather that it originates within the atoms themselves.
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Max Planck discovered the quantum theory . he assumed that energy was made of individual units or quanta
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Werner Heisenberg was born December 5, 1901
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Thomson discovered a method for separating different kinds of atoms and molecules by the use of positive rays
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Robert Millikan determined the unit charge of the electron in 1909 with his oil drop experiment at the University of Chicago.
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Rutherford concluded that the atom was mostly made up empty space except for a dense central region which became known as a nucleus.
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Theory of Relativity was created. it explains the general case of any sort of motion. Einstein's theory was based on two key principles: The principle of relativity: The laws of physics don't change, even for objects moving in inertial (constant speed) frames of reference.
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Albert Einstein wins Nobel PRize in Physics in 1921
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Robert Millikan won a Nobel Prize for Physics in 1923
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he formulated a type of quantum mechanics based on matrix
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Erwin Schrodinger developed an “Electron Cloud Model” in 1926.
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He proposed the " uncertainty relation " setting limits for how precisely the position and velocity of a particle can be simultaneously determined.
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Louis De Broglie wins the the Nobel Prize in Physics in 1929
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Chadwick discovered the neutron in atom
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For this work he shared with Dirac the Nobel Prize for 1933.
