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Period: 500 BCE to
Atomic Timeline Project
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460 BCE
Democritus Birth
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404 BCE
The End of the Peloponnesian War
The Peloponnesian War was a fight between Athens and the Spartans. The war was won by the Spartans after a long 30-year war. -
400 BCE
Democritus Discovery of the Atom
Democritus discovered the idea of atoms as indivisible particles that make up all matter. This discovery led to the modern model of the atom by founding its concept and idea. -
399 BCE
Socrates death
Socrates was an ancient Greek philosopher who provided the foundation for all of Western Philosophy. The ancient Athenian court killed Socrates on charges of impiety and corrupting the youth. -
370 BCE
Democritus Death
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John Dalton Birth
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Michael Faraday Birth
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John Dalton Discovery
Dalton proposed the atomic theory of Matter. The theory states that all matter is made of indivisible atoms. It also states that all atoms of a given element are identical in mass and properties. The third part of the theory states that compounds are combinations of two or more different types of atoms. -
The Lewis and Clark Expedition
The Lewis and Clark Expedition was a federally funded venture to explore the North American West. The venture was requested by Thomas Jefferson from Congress in 1803. -
Michael Faraday Discovery
Faraday's work with electricity and magnetism led to the discovery of electromagnetic induction, and he also made key contributions to the concept of electrolysis. This showed that atoms are associated with electrical charges. This made room for the idea that atoms could have structures like electrons. -
John Dalton Death
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Eugen Goldstein Birth
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JJ Thomson Birth
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Michael Faraday Death
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Robert Millikan Birth
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Ernest Rutherford Birth
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Neils Bohr Birth
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Eugen Goldstein Discovery
Goldstein discovered what he called Kanalstrahlen, also known as canal rays and called positive rays. Goldstein discovered there were rays traveling in the opposite direction from the cathode rays. -
Edwin Schroedinger Birth
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James Chadwick Birth
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JJ Thomson Discovery
JJ Thomson discovered the electron through the cathode ray tube experiment, showing that all atoms contained small negatively charged electrons. This contributed to the atomic model by introducing negatively charged electrons that float in a positively charged substance. -
The Spanish-American War
The Spanish-American War was a conflict between the United States and Spain that resulted in a decisive victory for America. -
Werner Heisenberg Birth
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Ernest Rutherford Discovery
Rutherford discovered the atomic nucleus threw a gold foil experiment. This leads to the conclusion that electrons orbit a tiny, dense, positively charged center where most of the atom's mass is concentrated. -
Neils Bohr Discovery
Bohr discovered that electrons orbit the nucleus in specific organized orbits. Bohr attributed to the atomic model by changing the electrons from randomly orbiting the nucleus to organized and specific orbits. -
Robert Millikan Discovery
Millikan created an oil drop experiment that confirmed the existence of the election and accurately determined its charge. He contributed to the atomic model by confirming the existence of the electron in the model. -
The Outbreak of World War I
World War I was the first global conflict recorded in history. The fight was triggered by the assassination of Archduke Franz Ferdinand of Austria, and other factors including militarism, economic rivalry, nationalism, and the alliance systems of the time. -
The End of World War I
World War I was a global conflict that ended threw the signing of the Armistice and the Treaty of Versailles. -
Edwin Schroedinger Discovery
Schroedinger created a wave equation that accurately calculated the energy levels of electrons in atoms. This can also calculate the probability of finding an electron in a certain region of space around the nucleus. This helped develop the atomic model by introducing the idea that the electrons don't follow sharply defined orbits, but rather are in regions around the nucleus. -
Werner Heisenberg Discovery
Heisenberg discovered the uncertainty principle, which states that a particle's position and momentum cannot both be known exactly. This discovery contributed to the atomic model by stating that it is impossible to know the position and momentum of the electron of an atom with perfect accuracy at the same time. -
The Discovery of Penicillin
Penicillin is an antibiotic that was invented by Alexander Fleming in 1928. Penicillin treats bacterial infections like strep throat, ear infections, and urinary tract infections. They work by attaching to and damaging the cell walls of bacteria. -
The Start of The Great Depression
The great depression was a worldwide economic disintegration that lasted 10 years. The depression started from a series of stock crashes in the United States. -
Eugen Goldstein Death
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James Chadwick Discovery
Chadwick discovered a neutral subatomic particle found in the nucleus with a proton called the neutron. Chadwicks discovery contributed to the atomic model by adding neutrons to the nucleus of the atom. -
The Rise of Adolf Hitler and the Nazi Party
Adolf Hitler was the leader of the Nazi Party from before, the beginning and end of World War II. Adolf Hilter was a leading reason for the Holocaust and the death of 11 million people. At this time they started rising rapidly in power and stability, preparing for what is now known as one of the most devastating mass murders in history. -
Ernest Rutherford Death
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The Beginning of World War II
World War II was a global conflict that stemmed from Adolf Hitler's invasion of Poland in September 1939 which drove Great Britain and France to declare war on Germany. This war lasted six years and took over 10 million lives. -
JJ Thomson Death
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Robert Millikan Death
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Edwin Schroedinger Dealth
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Neils Bohr Death
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James Chadwick Death
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Werner Heisenberg Death
