https://padlet.com/sashagrapkopo/Bookmarks Ellie Kaplan, Sasha Grapko, Ava Deviney, 1st Period, 9/7/2022 en-us 2022-01-20 22:00:16 UTC 2025-04-22 15:16:53 UTC hello@padlet.com sashagrapkopo https://padlet.com/sashagrapkopo/Bookmarks/wish/2280866860 The word "atom" was first created to mean the basic unit of a chemical element. The word was taken from the Greek word "atomos", which was first introduced by Democritus. He also discovered that atoms were 'uncuttable'.]]> 2022-09-02 15:28:03 UTC https://padlet.com/sashagrapkopo/Bookmarks/wish/2280866860 sashagrapkopo https://padlet.com/sashagrapkopo/Bookmarks/wish/2280866991 Aristotle proposed that matter is made up of four elements: fire, air, water, and earth. Additionally, he proposed that matter has four properties: hot, cold, dry, and wet. He is also held responsible for the 2000-year 'death of chemistry' in which no important discoveries over atomic theory were made. ]]> 2022-09-02 15:28:09 UTC https://padlet.com/sashagrapkopo/Bookmarks/wish/2280866991 sashagrapkopo https://padlet.com/sashagrapkopo/Bookmarks/wish/2280867465 John Dalton proposed a model in which atoms were imagined as tiny balls, like billiard balls. He also proposed that atoms of the same element are the same and atoms of different elements are different. He also discovered that atoms are made of a single material that is made into different shapes and sizes.]]> 2022-09-02 15:28:33 UTC https://padlet.com/sashagrapkopo/Bookmarks/wish/2280867465 sashagrapkopo https://padlet.com/sashagrapkopo/Bookmarks/wish/2280867646 JJ Thompson discovered electrons, using plum pudding as a model, where negative particles are stuck in a positively charged substance.]]> 2022-09-02 15:28:42 UTC https://padlet.com/sashagrapkopo/Bookmarks/wish/2280867646 sashagrapkopo https://padlet.com/sashagrapkopo/Bookmarks/wish/2280868353 Ernest Rutherford used the Gold Foil Experiment to discover that the atom contains mostly empty space with one very tiny nucleus, and he discovered the proton. The Gold Foil Experiment worked by shooting a beam of alpha particles at a sheet of gold foil, where a few of the particles were deflected. He concluded the thing deflecting them must be a tiny nucleus, which contains most of an atom's mass. ]]> 2022-09-02 15:29:18 UTC https://padlet.com/sashagrapkopo/Bookmarks/wish/2280868353 sashagrapkopo https://padlet.com/sashagrapkopo/Bookmarks/wish/2280868483 Rutherford confirmed the atom had a small, dense, positively charged core called the nucleus, and electrons travel in paths called energy levels.]]> 2022-09-02 15:29:24 UTC https://padlet.com/sashagrapkopo/Bookmarks/wish/2280868483 sashagrapkopo https://padlet.com/sashagrapkopo/Bookmarks/wish/2280868652 Bohr joined Rutherford in the task of making an accurate quantum model.]]> 2022-09-02 15:29:31 UTC https://padlet.com/sashagrapkopo/Bookmarks/wish/2280868652 sashagrapkopo https://padlet.com/sashagrapkopo/Bookmarks/wish/2280868760 Bohr presented a model in which electrons move in specific layers. His model can be compared to how the solar system works, with the electron in an atom revolving around the nucleus. He proposed that electrons are scattered around the nucleus at a distance, moving billions of times in one second. He also discovered that an electron's location depended on how much energy it has.]]> 2022-09-02 15:29:36 UTC https://padlet.com/sashagrapkopo/Bookmarks/wish/2280868760 elliekaplanl3 https://padlet.com/sashagrapkopo/Bookmarks/wish/2280878313 James Chadwick discovered the neutron.]]> 2022-09-02 15:37:47 UTC https://padlet.com/sashagrapkopo/Bookmarks/wish/2280878313 elliekaplanl3 https://padlet.com/sashagrapkopo/Bookmarks/wish/2280891366 Erwin Schrodinger used mathematical equations to describe the likelihood of finding an electron in a certain position, creating the modern quantum model.  He also discovered that electrons are found in electric clouds, not paths.]]> 2022-09-02 15:48:37 UTC https://padlet.com/sashagrapkopo/Bookmarks/wish/2280891366 elliekaplanl3 https://padlet.com/sashagrapkopo/Bookmarks/wish/2286524477 All matter is composed of atoms. Atoms are composed of protons, neutrons, and electrons. Each element has its own atomic number, which is equal to the number of protons in the nucleus.]]> 2022-09-07 14:26:50 UTC https://padlet.com/sashagrapkopo/Bookmarks/wish/2286524477