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404
404 B.C.
The Peloponnesian War ended -
420
450-450 B.C. Democritus
Democritus introduces the concept of the "atom." Interesting fact about Democritus is that he was a Greek philosopher, teacher, and he was born in Abdura. -
420
450-420 B.C. Democritus
The picture showes that Democritus believed that almost the entire universe was made up of "atoms." -
Jan 1, 1199
Richard
Richard the Lionhearted died of an arrow wound while besieging Chalus in Western France -
Sep 6, 1492
Columbus
Christopher Columbus "discovered" America -
French Revolution
The French Revolution begins -
Fort Sumner Falls
The Confederacy defeated the North's soldiers that were stationed at Fort Sumner and started the Civil War by doing so -
Thomson
J.J. Thomson discovered that atoms have electrons. Interesting facts about Thomson is that he gave six lectures at Yale Univeristy on electricity and matter. -
Thomson
The picture shows the Cathode-Ray Tube experiment that J.J. Thomson used to discover the electron -
Rutherford
Ernest Rutherford discovered that atoms have a nucleus. Interesting facts about Rutherford is that he he was a New Zealand chemist, and he won the Nobel Prize in chemistry. -
Rutherford
The picture shows the Plum Pudding Model that Ernest Rutherford used to discover that atoms have a nucleus -
Bohr
Niela Bohr discovered that atoms are at different energy levels. Interesting facts about Bohr is that he worked with Einstein and he was an advisor to the Manhattan Project which produced the first atomic bomb. -
Bohr
The picture shows the Bohr Model of the atom, which showed that atoms are at different energy levels -
Schrodinger
Erwin Schrodinger discovered that electrons move in orbitals. Interesting facts about Schrodinger is that he won a Nobel Prize, he was friends with Einstein, and his dad was a botanist. -
Schrodinger
The picture displays the Schrodinger Equation, which could be used to calculate the orbital that an electron is located on -
Chadwick
James Chadwick discovered that there are protons and neutrons in the nucleus. Interesting facts about Chadwick is that he wanted to study mathematics as an undergraduate, but he go in the registration line for physics by accident. -
Chadwick
The picture shows the gold foil experiment, which James Chadwick used to discover that there are protons and neutrons in the nucleus -
Algebra Invented
The Arabic scholar Al-Khwarizmi invented Alegebra
