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Transcript of Atomic Timeline
By: Kayleigh Eller
was the first person to propose the idea that matter was not infinitely divisible. He believed matter was made up of tiny individual particles called atoms.
Geometry was developed in china
rejected the atomic theory because it didn't agree with his own ideas on nature. His influence was so great,and the development of science so primitive that his denial of the existence of atoms went unchallenged for two thousand years!
Alexander the Great defeated Darius at the battle of Gargamela, triggering the decline of the Prussian Empire.
Came up with his own atomic theory independently of Democritus. His idea was that matter was made up of tiny infinite particles, which are basically atoms,indivisible and eternal.
Canaanites invent the first alphabet
proposed mechanical universe with small solid masses in motion.
proposed an atomic theory with spherical solid atoms based upon measurable properties of mass
Discovered oxygen, he was able to isolate it and identify it. He produced it by heating red mercuric oxide, and then it was clear that air was not an element
she and her husband discovered the radioactive elements polonium and radium
1700-1800 World Events ...
Benjamin Franklin was born in Boston
U.S Constitution was signed
French and Indian war erupted.
Alexander Hamilton gets killed in duel with VP Aaron Burr
The Alamo: 190 Americans held off 6,000 Mexican troops for 12 days, but were defeated on March 6.
Civil War begins at Fort Sumter, Charleston, SC
He began a series of cathode ray tube experiments to determine the ratio of its charge to its mass. By carefully measuring the effect of both magnetic and electric fields of the cathode ray Thomson was able to determine the charge to mass ratio of charged particles.
Published his own atomic theory describing the atom as having a central positive nucleus surrounded by negative orbiting electrons
Proposed a quantum model for the hydrogen atom , His model also correctly predicted frequencies of the lines in hydrogen's atomic emission spectrum. Bohr went even further with his atomic model by relating the hydrogen atom's energy states to the motion of the electron within the atom.
Queen Victoria dies and is succeeded by her son Edward VII
The first speed law is passed in New York State. It issued a maximum speed of 10 mph in populated districts, 15 mph in villages, and 20mph in open country.
The first transatlantic radiotelephone communication is made from Arlington, VA to the Eiffel Tower in Paris.
Determined the charge on a single electron by an experiment call "Oil Drop"
Viewed electrons as continuous clouds and introduced " wave mechanics" as a mathematical model of the atom.
Replaced the inadequate quantum theory with "quantum mechanics" - a theory of the mechanics of atoms,molecule, and other physical systems that subject to the uncertainty principle.
First commercial radio broadcast aired
Lie detector invented
Korean war begins
cathode ray tube
gold foil experiment
Bohrs spectra model
Oil Drop Experiment
Small spherical solid,indivisible model
Electron Cloud Model
Plum Pudding Model
Rutherford- Bohr model