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335
Aristole
He belived that every thing came down to basic 5 elements Earth,Water,Air,Fire,Aether. All of this is what they thought atoms would composed of at there simplest form. Scources:http://en.wikipedia.org/wiki/Aristotle -
400
Democritus
He belived that atoms were more and indivisable exceeds the heavier it is. Scroces:http://en.wikipedia.org/wiki/Democritus -
Dalton's atomic theory
Formulated the modern atomic theory. Elements are made up of extrimly small objects called "atoms". Atoms of the same element are of same size and mass but other elements very. Source:http://en.wikipedia.org/wiki/John_Dalton -
J.J. Thomson Discovey of electrons
Discovery of electrons using catho ray tubes.
He also discovered the natural radioactivity of potassuim
He was awarded the nobel prize in 1906
Souce:http://en.wikipedia.org/wiki/John_Dalton -
Max Planck
He proposed an idea that would cut down the maximum engergy need for the use of light bulbs. Scources:http://en.wikipedia.org/wiki/Max_Planck -
Ernest Rutherford
Know for his gold foil experment witch showed the nuclear nature of atoms.He made a model of what he thought an atom looked like in 1911 Scroces:http://en.wikipedia.org/wiki/Ernest_Rutherford -
Niels Bohr
Rutherford atom model in 1911 challenged thomson's 1904 plum pudding model Scroces:http://en.wikipedia.org/wiki/Niels_Bohr -
electron cloud model
It is a model that describes how electrons go around the nucleus. scorces:http://lionsgensci.wikispaces.com/file/view/I15-53-quantum.jpg/137474757/I15-53-quantum.jpg
http://simple.wikipedia.org/wiki/Electron_cloud -
James Chadwick exstence of neutrons
He provide that the existance of neutrons. If particles decoid of any electrical charge it would make a large esplostion so they did this with helium creating nuclear bombs he won the nobel peace prize for physics in 1935
scorces:http://www.nobelprize.org/nobel_prizes/physics/laureates/1935/chadwick-bio.html -
Alber Einstein
He had been knowen for his work on the Manhattan Project it started when he sent a letter to president roosevelt in 1939 to tell him about the germans plans for atomic bombs so the atmic bomb race was off and they raced to make an atomic bomb in fear that the germans might beat them to it. Scorces:http://en.wikipedia.org/wiki/Albert_Einstein
