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Atomic Timeline

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by

kayleigh eller

on 18 October 2013

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Transcript of Atomic Timeline

Atomic Timeline
By: Kayleigh Eller
422
1500
323
384-322
1600
600
Democritus
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
Aristotle
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.
Kanada
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
Ancient
B.C
B.C
B.C
Scientists...
World Events...
B.C
B.C
III
B.C
1700-1800
1700-1800 Scientists...
Isaac Newton
proposed mechanical universe with small solid masses in motion.
Dalton
proposed an atomic theory with spherical solid atoms based upon measurable properties of mass
Joseph Priestly
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
1704
1774
1803
600
B.C
422
B.C
384-322
B.C
1600
B.C
1500
B.C
323
B.C
1800-1900
1800-1900
SCIENTISTS...
Roentegen
Discovered X-rays
Becquerel
Discovered Radioactivity
Curie
she and her husband discovered the radioactive elements polonium and radium
1895
1896
1898
1700-1800 World Events ...
Benjamin Franklin was born in Boston
U.S Constitution was signed
French and Indian war erupted.
1706
1754
1787
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
1800-1900
World Events
1804
1836
1861
1900-1915
Scientists
_
Thomson
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.
Rutherford
Published his own atomic theory describing the atom as having a central positive nucleus surrounded by negative orbiting electrons
Bohr
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.
1904
1911
1913
_
World Events
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.
1901
1904
1915
1915- 1950
Millikan
Determined the charge on a single electron by an experiment call "Oil Drop"
Schrodinger
Viewed electrons as continuous clouds and introduced " wave mechanics" as a mathematical model of the atom.
Heisenberg
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.
Chadwick
Discovered neutrons
Scientists...
1921
1926
1929
1932
First commercial radio broadcast aired
Lie detector invented
Korean war begins
World Events...
1920
1921
1950
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
Full transcript