https://padlet.com/560045786/zd6o0p3zta5g Made with a dash of Ugandan Knuckles en-us 2018-01-30 17:26:47 UTC 2024-05-27 02:33:04 UTC hello@padlet.com 560045786 https://padlet.com/560045786/zd6o0p3zta5g/wish/226217621 Born on 460 BCE. We do not know what date he found his discovery was, the Greek philosopher Democritus suggested that all matter was formed of different types of tiny discrete particles and that the properties of these particles also determined the properties of matter.]]> 2018-01-30 17:34:28 UTC https://padlet.com/560045786/zd6o0p3zta5g/wish/226217621 560045786 https://padlet.com/560045786/zd6o0p3zta5g/wish/226218021 Found the nucleus of a atom. He discovered this in 1912. ]]> 2018-01-30 17:35:05 UTC https://padlet.com/560045786/zd6o0p3zta5g/wish/226218021 560045786 https://padlet.com/560045786/zd6o0p3zta5g/wish/226218165 he was a british chemist and physicist known for his discovery of the element thallium and his studies on the cathode rays which has been fundamental in the development of atomic physics. He found his discovery in 1903.]]> 2018-01-30 17:35:19 UTC https://padlet.com/560045786/zd6o0p3zta5g/wish/226218165 560045786 https://padlet.com/560045786/zd6o0p3zta5g/wish/226218309 He discovered the electron in 1897. His model mostly contains electrons.]]> 2018-01-30 17:35:32 UTC https://padlet.com/560045786/zd6o0p3zta5g/wish/226218309 560045786 https://padlet.com/560045786/zd6o0p3zta5g/wish/226218384 Experiments with gases that first became possible at the turn of the nineteenth century led Dalton to announce his discovery in 1803]]> 2018-01-30 17:35:42 UTC https://padlet.com/560045786/zd6o0p3zta5g/wish/226218384 560045786 https://padlet.com/560045786/zd6o0p3zta5g/wish/226218512 He shows that a atom is mostly empty space. He found this discovery out in 1907]]> 2018-01-30 17:35:53 UTC https://padlet.com/560045786/zd6o0p3zta5g/wish/226218512 560045786 https://padlet.com/560045786/zd6o0p3zta5g/wish/226218650 The French scientist Henri Becquerel discovered radioactivity in 1896. ... He realized that some invisible radiation had been emitted from the uranium. He won the Nobel Prize in 1903, along with Marie and Pierre Curie, for his discovery, and the SI unit of radioactivity, the becquer (Bq), was named after him.]]> 2018-01-30 17:36:05 UTC https://padlet.com/560045786/zd6o0p3zta5g/wish/226218650 560045786 https://padlet.com/560045786/zd6o0p3zta5g/wish/226218926 The atom was believed to be composed of a positively charged nucleus surrounded by negatively charged electrons. In 1932, James Chadwick bombarded beryllium atoms with alpha particles. An unknown radiation was produced.]]> 2018-01-30 17:36:32 UTC https://padlet.com/560045786/zd6o0p3zta5g/wish/226218926