munity College-CHEM 101-Sprmgi8 > Activites and Dr Dates Quiz 4 2/15/2018 11 55
ID: 1083151 • Letter: M
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munity College-CHEM 101-Sprmgi8 > Activites and Dr Dates Quiz 4 2/15/2018 11 55 PM65/82/ r201803 13 PM Perodic Tabe Question 17 of 17 Sapling Learning Below are listed some majgr contributions to the development of atomic theory. Identiy the scienist associated with each contribution by dragging his name to the blank next to his contribution He discovered the electron. He discovered periodic changes in properties of elements when they are listed in order of their atomic weights He experimented with the defiection of cathode rays by a magnetic field. Yo He ned out experiments, using gold folthat measured the scattering of positively charged apha particles by heavy atoms You He proposed that atoms are the basic units of mater He proposed the model of the atom had most of ts mass ooncentrated in a very small nudleus. Help He proposed that in a chemical reaction, atoms are nether created nor destroyed O Web Check Anser O TechnExplanation / Answer
1) J.J.Thomson discovered in 1897 electron
2) Dmitri Mendeleev discovered periodic changes in properties of elements
3) the English physicist J.J. Thomson
4) Rutherford's Gold Foil Experiment
5) the English physicist J.J. Thomson
6) Ernest Rutherford.
7)John Dalton
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