-
Jan 7, 1000
Democritus
460 B.C.--- Early Greek philospher. Helped come up with the Atomic Theory of the Universe - said that atoms flying around combine to create new substances. In other words, everything is made up of atoms. Sometimes referred to as "The Father of Modern Chemistry." -
Jan 9, 1004
Aristotle
450 B.C--- Aristotle declared that there are only four elements. Water, fire, air, and earth. He says that there are no atoms. -
Antoine Lavoisier
Antoine Lavoisier concluded that "total mass of material present before a chemical reaction remains unaltered after the chemical reaction". -
John Dalton
Developed the Law of Partial Pressures, but he is best known for developing the Modern Atomic Theory of matter. -
Joseph Proust
Joseph Proust states that "different samples of the same compound always contain its constituent elements in the same proportion by mass." A french chemist Joseph Proust made a great breakthrough when he observed that elements always combine in fixed proportions by weight when they form compounds, so a gram of hydrogen will always react with eight grams of oxygen to form water. -
Amedeo Avogardo
Created a principle that explained if you have equal volume, equal pressure, and equal temperature, you will have equal number of gas particles in 2 containers. There is also an important number in chemistry nade after him that tells us the number of atoms/molecules in 1 mole of a substance [known as Avogadro's number]. -
Henri Becquerel
Henry Becquerel was famous for the discovery of how uranium compounds darken the photographic plates. He was a French scientist and he was born in Paris and became a professor of physics at the museum of natural history. One unit of measurement is named after him, namely the disintegration per second of a radioactive substance. -
WIlliam Crooks
WIllam's main contribution to the atomic theory was his identification of many properties of cathode rays; Crookes discovered that these rays move in a straight line, cause glass to glow, carry negative charges, and are capable of being deflected by electric fields. Crookes’ discoveries would directly influence the work of J. J. Thomson, the man who finally identified the electron -
Marie Curie
First woman to win Nobel Prize. Studied uranium and discovered many radioactive elements such as radium. -
Max Planck
Planck revealed that he had successfully uncovered the relationship between the energy and the frequency of radiation. Furthermore, Planck had successfully developed the idea of the quanta, which he defined as a discrete unit of energy, which later figured importantly in the area of quantum physics -
JJ Thompson
Best known for his discovery of the electron. He used a cathode ray tube to aid in this discovery. He also is responsible for discovering isotopes and the mass spectrometer (an instrument used to separate out gas ions). -
Albert Einstien
Albert's most famous theory was the theory of relatively, which was not actually confirmed until many years after its initial publication. In this theory, Einstein had discovered the relationship between energy and mass, expressed as E=mc², in which E stands for energy, M represents mass, and C² represents the square of the speed of light. -
Robert Millikan
Robert was known for the discovery of the electric charge. In order to figure this out he used his famous oil-drop experiment, which was actually inspired by other similar experiments which had been conducted earlier, although none had been nearly as successful as Millikan’s would prove to be. -
Ernest Rutherford
Discovered that the nucleus is a small, dense center to every atom. He used the gold foil experiment to help him discover the nucleus. Also studied radioactive half-life and proved that arioactivity involved the transmutation (transformation) of 1 element to another. -
Henry Mosely
Arranged the periodic table as we see it today; based on atomic numbers. -
Niels Bohr
Built off Rutherford's discovery. Gave us the "Bohr Model" of an atom - says electrons orbit around the nucleus of an atom similar to how the planets orbit around the sun. -
World War 1
WW1, also known as the First World War, was a global war centred in Europe that began on 28 July 1914 and lasted until 11 November 1918. -
Louis de Brogile
Louis discovered the theory of particle-wave duality. Basically, de Broglie believed that electrons possessed a dual nature, with properties representative of both particles and waves. -
Werner Heisenberg
Heisenberg’s breakthroughs include the foundation of quantum mechanics, which he is primarily responsible for, and the advancement of quantum theory. Of particular note is Heisenberg’s famous Uncertainty Principle, in which Heisenberg revealed that it is an impossibility to know a particle’s position and velocity. -
James Chadwick
Discovered the neutron and proved it had no charge (neutral). -
World War II
World War II (WWII or WW2), also known as the Second World War, was a global war. It is generally considered to have lasted from 1939 to 1945, although some conflicts in Asia that are commonly viewed as becoming part of the world war had begun earlier than 1939. It involved the vast majority of the world's nations—including all of the great powers—eventually forming two opposing military alliances: the Allies and the Axis. It was the most widespread war in history. -
Erwin Schrodinger
He indicates that the electron travel randomly in a region or space around the nucleus rather than in fixed orbits. Each space has a definite energy level. Energy levels have sub levels, or orbitals within them. -
Holocaust
The Holocaust was the mass murder or genocide of approximately six million Jews during World War II, a programme of systematic state-sponsored murder by Nazi Germany, led by Adolf Hitler and the Nazi Party, throughout the German Reich and German-occupied territories. -
Worst US Blizzard
One of the worst blizzards in American history hits the Eastern states. Over 100 deaths result from this storm. -
Life on Mars?
NASA announces that Martian meteorite ALH84001 contains evidence of primitive life on the planet Mars. -
Super Bowl XXXIII
The Broncos defeated the Falcons 34-19. -
Colombine Mascare
The Columbine High School massacre was a school shooting which occurred on April 20, 1999, at Columbine High School in Columbine, an unincorporated area of Jefferson County in the State of Colorado. -
Kenya Airways Flight 431
Off the coast of Ivory Coast, Kenya Airways Flight 431 crashes into the Atlantic Ocean, killing 169 -
Sandy Hook Shooting
Adam Lanza fatally shot 20 children and 6 elementary teachers in a mass murder at Sandy Hook Elementary school. -
Hurricane Sandy
Hurricane Sandy (unofficially known as "Superstorm Sandy") was the deadliest and most destructive hurricane of the 2012 Atlantic hurricane season, as well as the second-costliest hurricane in United States history. -
What are Atoms?
-
Bill Nye
-
Just How Small Is An Atom?
