-
460 BCE
Democritus Born
-
400 BCE
Democritus Discovery
Democritus was the first to say that all materials were made up of uniform, solid, indestructible, structures called atoms. He also theorized that they moved in infinite numbers through empty space. -
390 BCE
Battle at the Allia River
The Battle at the Allia River between Rome and the Gauls. This resulted in a Gallic victory and the sack and burn of Rome. -
370 BCE
Democritus Death
-
John Dalton Born
-
Michael Faraday Born
-
John Dalton Discovery
John Dalton theorized that atoms could neither be created nor destroyed. He also was the first to theorize that all atoms of a certain element had identical size and mass while differing elements had different atoms. -
White house burning
During the war of 1812, in 1814 the British burnt down the white house along with many other federal buildings. -
Michael Faraday Discovery
He was the first to realize that atoms were somehow related electromagnetically. Although he did not know exactly how they were. -
John Dalton Death
-
Eugen Goldstein Born
-
JJ Thomson Born
-
Michael Faraday Death
-
Robert Millikan Born
-
Ernest Rutherford Born
-
Niels Bohr Born
-
Eugen Goldstein Discovery
He discovered that inside an atom, there was evidence of positively charged particles. -
Erwin Schrodinger Born
-
James Chadwick Born
-
Electron Discovered
JJ Thomson discovers negatively charged particles in the atom. -
Werner Heisenberg Born
-
Airplane
Wilbur and Orville Wright make the first functional powered airplane called the Wright Flyer. -
JJ Thomson Plum Pudding Model
Using his discovery of the electron and the idea of positively charged matter in the atom he proposed his own idea of what an atom looked like. He claimed that there were negatively charged electrons within a collection of positively charged matter. -
Robert Millikan Discovery
Robert Millikan researched electrons and discovered the exact magnitude of the electron's charge. He also discovered that every electron has the same amount of negative charge. -
Nuclear Model
Rutherford made a model of what he thought the atom looked like. He proposed that the positively charged matter discovered earlier was in the middle with the electrons on the outside. -
Niels Bohr Discovery
Bohr made a new model of the atom that proposed that the electrons have discrete energy levels and that the electrons have a stable orbit around the nucleus of the atom. -
Proton Discovered
Ernest Rutherford discovered that the positively charged matter discovered earlier was a particle called a proton. -
Prohibition
Federal law passed banning alcohol and beginning prohibition in the United States. -
Erwin Schrodinger Discovery
He applied a wave equation that he formulated to correctly calculate the chance that an electron was in an area surrounding the nucleus. he used this discovery to make a model with Werner Heisenberg that consisted of a dense cloud of nucleus surrounded by a dense cloud of electrons. -
Werner Heisenberg Discovery
Werner Heisenberg uses theories in quantum mechanics to make the “electron cloud” model of the atom with Erwin Schrodinger. -
Eugen Goldstein Death
-
James Chadwick Discovery
He discovered the neutron, which was a neutral-charged particle in the nucleus of an atom along with the positively charged proton. He then used this discovery to create his model of the electron cloud model using the neutron. -
Hoover Dam
All features of the Hoover Dam were completed. It immediately became the tallest dam in the world. -
Ernest Rutherford Death
-
World War II
World War II begins with the German invasion of Poland. -
JJ Thomson Death
-
Robert Millikan Death
-
Erwin Schrodinger Death
-
Niels Bohr Death
-
James Chadwick Death
-
Werner Heisenberg Death