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Atomic History

Chemistry

QuestionAnswer
Democritus if matter could be divided, it would not be able to put back together
Aristotle He thought that all matter was made up of a combination of his four elements. This was proven wrong
John Dalton (4 points) [English] "Billard Ball Model" 1.All matter is made up of atoms which are invisible and indestructible 2.All atoms of a given element are identical in mass and properties 3.Compounds are formed by a combination of two or more different kinds of atoms 4.REARRANGEMENT
Law of Conservation of Mass the mass before = the mass after
Law of Definite Proportions atoms combine in whole ratios
Law of Multiple Proportions atoms can combine in many different ways
J.J. Thomson [American] he discovered electrons "Plum Pudding Model"
Ernest Rutherford [Kiwi] the majority of an atom is empty space but in the centre there is a positively charged very dense nucleus -discovered the nucleus
Neils Bohr [Danish] each orbit holds few electrons electrons can jump between orbits - go up but want to come back down further the electron, the more energy it has the frequency of lights is given off depending on which shell it came from
Created by: jakiday
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