Atomic convention
Category: Other
Updated: 29 Jan 2020
Contributors
Created byReese Louthain
Attachments
Events
John Dalton-
father of the atomic theory; he discussed how atoms combine in the law of multiple proportions as his atomic modelJJ Thomson-
discovered the first subatomic particle--negatively charged electrons using the cathode ray tube; his atomic model was the plum pudding model (atoms were solidly positive with electrons floating in the positive)Ernest Rutherford-
"discovered" the proton & that the atom is mostly empty space with a nucleus with mass and surrounding electrons; worked with Chadwick, Bohr, and ThomsonNiels Bohr-
created the planetary atomic model in which the electrons orbit the nucleus; worked with Chadwick and RutherfordJames Chadwick-
discovered the neutron; worked with Rutherford and Bohr and confirmed their findingsAlbert Einstein-
discovered the photoelectric effect; quantum theory; he also established Brownian motion to establish electron distance from the nucleusDimitri Mendeleev-
arranged the first periodic table--based on atomic massHenri Becquerel-
discovered radioactivity using Uranium saltThe Curies-
used Becquerel's discovery to discover the elements Radium and Polonium; coined term "radioactivity"Werner Heisenberg-
used a gamma ray microscope to determine electron position (the electron cloud); also recognized the uncertainty principle; worked with SchrödingerErwin Schrödinger-
worked with Heisenberg to discover a more accurate representation of the electron cloudHenry Moseley-
discovered the atomic number of elements using x-rays; made the periodic table more accurateDemocritus-
atomos (later known as atoms) are solid spheres that cannot be broken down any farther; seashell experimentAristotle-
theory involved the overlap of the elements (air, water, earth, & fire) and 4 physical properties (hot, dry, cold, & wet); his theory set atomic theory back almost 1000 yearsThales of Miletus-
theorized all substances were a combination of simpler substances and that water was the nature of matter
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