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all matter is made up of atoms -
beieved that atoms were hard and unifrom and moved in infinite space -
believed that atoms can break down into geometric shapes -
found that matter is made of atoms and matter can be neither created or destroyed -
atoms of the same element are the same but different elements have different atoms. -
layed down the buiding blocks of the periodic table -
found out that putting elements in order in increasing atomic weight will group them in groups of 7 -
found the physical and chemical properties of elements were related to their atomic mass -
was disovered by henreich rudolf found that when eletricmagnetic radiation asses through a electron and the electron takes the radiation -
henri becquarel he found the element radium a highly radioactive element. -
J.J. Thompson found the electrons in cathode rays -
it is a historical odel of the atom show how the elcrons are all over the place. -
different atoms can absorbs different amounts and energy -
ernest rutheford found tht putting postiviley charged atoms through a piece of gold found that atms are mostly open space -
jj thompsons experiment showed that all atoms have a postive negative and neutral charged particle. -
found the charge of and electron by using the falling drop method -
was a basic over making the elctrons pictured as plantes orbiting the atom by nick bohr -
found the tomic number is the number of postively charged particles. -
a experment was performed by ernest rutherford and he split a atom revaling a postiveley charged particle -
found and equation the energy and place of the electron. -
leaurate werner hesienberg came up with the theory that we can not now the exct speed of a particle -
sir james chadwick discovered a uncharged particle.