https://padlet.com/tor8new/8nhbv5g2cr0upv0d Using my notes to construct a timeline outlining early contributions made by philosophers and scientists to atomic theory en-us 2020-10-22 16:43:54 UTC 2020-10-22 18:10:40 UTC hello@padlet.com tor8new https://padlet.com/tor8new/8nhbv5g2cr0upv0d/wish/853303192 Democritus and Leucippus developed the theory of atomism. ]]> 2020-10-22 16:46:24 UTC https://padlet.com/tor8new/8nhbv5g2cr0upv0d/wish/853303192 tor8new https://padlet.com/tor8new/8nhbv5g2cr0upv0d/wish/853493076 Proposed the law of conservation of mass, which in summary describes that if matter changes shape or its form, the mass will always stay the same.]]> 2020-10-22 17:26:23 UTC https://padlet.com/tor8new/8nhbv5g2cr0upv0d/wish/853493076 tor8new https://padlet.com/tor8new/8nhbv5g2cr0upv0d/wish/853500240 Determoned that elements exsist as discreet packets of matter.]]> 2020-10-22 17:27:55 UTC https://padlet.com/tor8new/8nhbv5g2cr0upv0d/wish/853500240 tor8new https://padlet.com/tor8new/8nhbv5g2cr0upv0d/wish/853503633 J.J Thompson discovered by measuring the amount of heat the cathode rays generated that they were not rays or waves at all. Instead he discovered they are small and light negatively charged particles that he called electrons. He called this the plum pudding model.]]> 2020-10-22 17:28:40 UTC https://padlet.com/tor8new/8nhbv5g2cr0upv0d/wish/853503633 tor8new https://padlet.com/tor8new/8nhbv5g2cr0upv0d/wish/853515094 In 1909 he performed an experiment known as the gold foil experiment. He used alpha particles that are positvely charged to get a correct response from the experiment. Using this test discovered some rays went through the foil and some bounced back leaving him to find that there must be a concentrated area in the atom and that the rest is empty space. He called this concentrated area the nucelus.]]> 2020-10-22 17:31:06 UTC https://padlet.com/tor8new/8nhbv5g2cr0upv0d/wish/853515094 tor8new https://padlet.com/tor8new/8nhbv5g2cr0upv0d/wish/853535721 He continued with his experiment and discovered the tiny positevly charged ions we previosly called the alpha particles. He renamed them to what we know today as the proton.]]> 2020-10-22 17:35:31 UTC https://padlet.com/tor8new/8nhbv5g2cr0upv0d/wish/853535721 tor8new https://padlet.com/tor8new/8nhbv5g2cr0upv0d/wish/853544679 In 1911 Niels Bohr thought he discovered where the electrons are most likely to orbit the nucelus.]]> 2020-10-22 17:37:28 UTC https://padlet.com/tor8new/8nhbv5g2cr0upv0d/wish/853544679 tor8new https://padlet.com/tor8new/8nhbv5g2cr0upv0d/wish/853549248 The same year Werner proved Niels Bohr's discovery was very wrong. He acknowledged that it is nearly impossible to know exactly where the electrons could be. ]]> 2020-10-22 17:38:28 UTC https://padlet.com/tor8new/8nhbv5g2cr0upv0d/wish/853549248 tor8new https://padlet.com/tor8new/8nhbv5g2cr0upv0d/wish/853557712 He than proposed the Quantum Theory, this stated that electrons were not particles or waves and discovered where the electrons possible location could be in the atom and called them the orbitals.]]> 2020-10-22 17:40:14 UTC https://padlet.com/tor8new/8nhbv5g2cr0upv0d/wish/853557712