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100
Democritus (465 BCE)
His mentor, came up with the atomic theory, but Democritus adopted it. It states "The universe is composed of two elements, the atoms and the void in which they exist an move". -
100
Aristotle (364 BC)
Believed in the four elements of earth, wind, water, and fire. He believed everything on Earth was made of small amounts of each of these elements. He lead the world astray on the atomic theory -
452
Italy invaded by Atilla the Hun
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Northern Lights first Recorded
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George Washington President
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Joseph Proust
Definite Properties, which states that a compound is composed of exact proportions of elemnts by mass reguardless of how the compund was created -
John Dalton
John Dalton said that all matter was made of atoms. His model of an atom was simply a sphere. -
Henri Becquerel
Discovered natural radioactivity in elements -
Max Planck
Originatior of the quantum theory of energy, which is found at the base of all physics and most atomic models -
Albert Einstein
Albert Einstein mathematically proved the existance of atoms. He said that they were tiny invisible particles. -
JJ Thomson
Thomson discovered the electron. He proposed the plum pudding model of the atom, a model in which the electrons were randomly spaced throughout a positively charged sphere. -
Ernest Rutherford
Worked with Geiger, and Marsden to carry out the Geiger-Marsden experiment to examine the stucture of an atom. They found an atomic nucleus with became an integral part of the Rutherford model of an atom -
Robert Millikan
Millikan determined the charge and mass of an electron. -
Niels Bohr
Niels Bohr created the Borh model of the atom that has a positively charged nucleus and electrons that orbit the nucleus. -
Titanic Sinking
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Women Right to Vote
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Louis de Brogile
Louis de Brogile discovered that electrons move as waves under certain conditions. -
Erwin Schrodinger
He developed the quantumn mathematical model of the atom, which predicts the odds of the location of the electron -
Werner Heisenberg
Heisenberg contributed to the atomic theory by including quantumn mechanics, the branch of mechanics based on quantumn theory, used for interpreting the behavior of elementary particles and atoms -
James Chadwick
Chadwick discovered the existance of neutrons -
FDR takes 3rd Term
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Anne Frank takes Refuge
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US lands on Moon
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First Mc Donalds Opens
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Pac-Man Video Game Released
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Students Claire & Garrett get A on Timeline Project
