https://padlet.com/jmburton2/eswsjvyqhtztqeox Scientist timeline en-us 2020-10-28 21:39:41 UTC 2024-12-15 19:03:47 UTC hello@padlet.com jmburton2 https://padlet.com/jmburton2/eswsjvyqhtztqeox/wish/871480113 Democrotis was famous for discovering the concept of the atom. He experimented by breaking a seashell down into a fine powder to see how far he could break it down. Once he had it in a powder form he could not break it down anymore.  

]]> 2020-10-28 21:40:43 UTC https://padlet.com/jmburton2/eswsjvyqhtztqeox/wish/871480113 jmburton2 https://padlet.com/jmburton2/eswsjvyqhtztqeox/wish/871493731 Ernest Rutherford's most famous experiment is the gold foil experiment. He aims alpha particles at a gold foil and found that some of the particles bounce back, meaning that an atom is empty space surrounding a nucleus]]> 2020-10-28 21:48:38 UTC https://padlet.com/jmburton2/eswsjvyqhtztqeox/wish/871493731 jmburton2 https://padlet.com/jmburton2/eswsjvyqhtztqeox/wish/871501923 Dmitri Mendeleev made the symbols for all the chemical elements. He put them in order according to atomic weights, creating the periodic table.]]> 2020-10-28 21:53:16 UTC https://padlet.com/jmburton2/eswsjvyqhtztqeox/wish/871501923 jmburton2 https://padlet.com/jmburton2/eswsjvyqhtztqeox/wish/871508132 Niels Bohr was a Danish physicist who made big contributions to understanding atomic structure and quantum theory, for which he received a Nobel Prize in Physics. Founded the quantum theory.]]> 2020-10-28 21:56:54 UTC https://padlet.com/jmburton2/eswsjvyqhtztqeox/wish/871508132 jmburton2 https://padlet.com/jmburton2/eswsjvyqhtztqeox/wish/871515006 J.J. Thomson's experiments with cathode ray tubes showed that all atoms contain tiny negatively charged subatomic particles or electrons. He discovered the electron, revolutionizing the understanding of the atom.]]> 2020-10-28 22:01:01 UTC https://padlet.com/jmburton2/eswsjvyqhtztqeox/wish/871515006 jmburton2 https://padlet.com/jmburton2/eswsjvyqhtztqeox/wish/871522414 James Chadwick played an enormous role in the atomic theory. James found that atoms had protons through his experiment. James bombarded beryllium atoms with alpha particles. This caused an unknown radiation to be formed, which showed him that atoms had protons.]]> 2020-10-28 22:05:12 UTC https://padlet.com/jmburton2/eswsjvyqhtztqeox/wish/871522414 jmburton2 https://padlet.com/jmburton2/eswsjvyqhtztqeox/wish/871529812 John Dalton created the atomic theory that all matter was made up of atoms. He proposed  that different materials had different sized and massed atoms. He also developed methods to calculate atomic weights and structures.]]> 2020-10-28 22:09:07 UTC https://padlet.com/jmburton2/eswsjvyqhtztqeox/wish/871529812 jmburton2 https://padlet.com/jmburton2/eswsjvyqhtztqeox/wish/871536397 Erwin Schrodinger formulated a wave equation that accurately calculated the energy levels of electrons in atoms. ]]> 2020-10-28 22:13:09 UTC https://padlet.com/jmburton2/eswsjvyqhtztqeox/wish/871536397 jmburton2 https://padlet.com/jmburton2/eswsjvyqhtztqeox/wish/871542153 Werner Heisenberg contributed to atomic theory by formulating quantum mechanics in terms of matrices and in discovering the uncertainty principle, which states that a particle's position and momentum cannot both be known exactly. Werner measured the position of an electron with a gamma ray microscope as his experiment.]]> 2020-10-28 22:16:38 UTC https://padlet.com/jmburton2/eswsjvyqhtztqeox/wish/871542153