Discovered miniscule quantities of matter in Ancient Greece - became the building blocks of Chemistry and main part of all life
Great Wall of China Built
Birth of Christianity
Birth of Muhammad
Boston Tea Party
Declaration of Independence
The Atomic Theory - John Dalton, England
Discovered that all matter is made of atoms
Assassination of Abraham Lincoln
April 15, 1865
End of Civil War
May 9, 1865
Creation of Periodic Table - Dmitri Mendeleev, Russia
Produced table based on atomic weights, but arranged "periodically"
Chicago Fire starts
October 10, 1871
Electron Discovery - JJ Thompson, New England
Electrons were first discovered as the constituents of cathode rays. J. J. Thomson showed the rays were composed of a previously unknown negatively charged particle, which was later named the electron.
Existence of Charged Subatomic Particles - British scientist JJ Thomson
Realized that there were small particles within the nucleus, detected a charge and realized there were subatomic particles within matter.
Discovery of Isotopes - Frederick I Soddy, England
Frederick Soddy, an English radio chemist Explained aspects of radioactivity & first isotope discovered by JJ Thompson
Discovery of the Nucleus - Earnest Rutherford, New Zealand
The nucleus is the small, dense region consisting of protons and neutrons at the center of an atom. It was discovered in 1911 by Ernest Rutherford based on the Geiger–Marsden gold foil experiment.
Treaty of Versailles
June 28, 1919
Discovery of Proton - Earnest Rutherford, New Zealand
Detected very small particles with positive charges as opposed to the previous discovery of negative charges when conducting an experiment. Called these protons!
Electron Cloud Model - Erwin Schrödinger, Austria
Used mathematical equations to determine where certain electron locations were and came up with model in layers with protons in one place and electrons in another.
Quantum Mechanical Model - many scientists, Austria/Germany
Scientists Heisenberg, Burn, Jordan and Schrödinger worked to discover a mathematical application of the quantum theory- showcasing both matter and wave.
Neutron Discovery - James Chadwick, England
James Chadwick realized there were other uncharged particles within the nucleus wth same mass as protons. He experimented and they showed no charge but they were there.
Bombing of Pearl Harbor
December 7th, 1941
End of Holocaust
May 8, 1945
World War II ends
September 2 1945
Birth of my father
December 31, 1962
MLK "I Have a Dream"
August 28, 1963
Assassination of JFK
November 22, 1963
Discovery of subnuclear particles (quarks) - Murray Gell-Man
Murray Gell-Mann looked at the table of known particles and the experimental data, and it was clear that the neutron and proton could be made up of three particles with fractional charges, which he then called quarks.