Chemistry Timeline


Egyptians create 365 day calendar

2400 BCE

First Olympic Games

776 B.C.

Existence of Atoms - Greek Philosopher Democritus

400 BC

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

206 BC

Birth of Christianity

33 AD

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.

Man walked on the Moon

20 July 1969

My birth

March 4th, 2001

Bombing of World Trade Center

September 11, 2001

iPhone launches

June 29, 2007

My first day of Elementary School

August 2007

My first day of high school

June 19, 2015