https://padlet.com/4046212/o1651btv9kk0b1al Onari Walcourt Per.1 en-us 2023-09-27 23:02:43 UTC 2023-09-27 23:55:04 UTC hello@padlet.com https://padlet.net/icons/png/269b.png 4046212 https://padlet.com/4046212/o1651btv9kk0b1al/wish/2723857577 Showed that common substances always broke down into the same elements in the same proportions.
He concluded that the various compounds were combinations of atoms of different elements, each of a particular size and mass that can neither be created nor destroyed.]]> 2023-09-27 23:21:15 UTC https://padlet.com/4046212/o1651btv9kk0b1al/wish/2723857577 4046212 https://padlet.com/4046212/o1651btv9kk0b1al/wish/2723862877 In 1897, he discovered the electron.
He showed atoms as uniformly packed spheres of positive matter filled with negatively charged electrons.]]> 2023-09-27 23:30:26 UTC https://padlet.com/4046212/o1651btv9kk0b1al/wish/2723862877 4046212 https://padlet.com/4046212/o1651btv9kk0b1al/wish/2723869992 He decided to investigate atoms more closely, by shooting small, positively charged alpha particles at a sheet of gold foil.
He concluded that atoms consisted largely of empty space with just a few electrons, while most of the mass was concentrated in the center, which he termed the nucleus.]]> 2023-09-27 23:41:53 UTC https://padlet.com/4046212/o1651btv9kk0b1al/wish/2723869992 4046212 https://padlet.com/4046212/o1651btv9kk0b1al/wish/2723875328 He stipulated that electrons orbit the nucleus at fixed energies and distances, able to jump from one level to another, but not to exist in the space between.
Experiments showed that rather being discrete particles, electrons were show to move like waves.]]> 2023-09-27 23:50:36 UTC https://padlet.com/4046212/o1651btv9kk0b1al/wish/2723875328 4046212 https://padlet.com/4046212/o1651btv9kk0b1al/wish/2723878148 He showed that it was impossible to determine both the exact position and speed of electrons as they moved around an atom.]]> 2023-09-27 23:55:04 UTC https://padlet.com/4046212/o1651btv9kk0b1al/wish/2723878148