Honors Chemistry Scientists Study Guide

Honors Chemistry Scientists Study Guide Democritus - Answer️️ -Matter is made of "indivisible parts" he called atomos "meaning cannot be cut" Democritus - Answer️️ -Because of his ideas, we still call these particles atoms Dalton - Answer️️ -Proposed that atoms are small indivisible spheres Dalton's Atomic Model - Answer️️ -Billard Ball model and was hard sphere (model) J.J Thompson - Answer️️ -He did experiments with cathode ray tubes. J.J Thompson - Answer️️ -He found that all atoms contain a little particle called electron. Thompson's Atomic Model - Answer️️ --called "Plum Pudding" or "Raisin Bun" -was called positive dough with negative electrons like raisins scattered throughout (model) Rutherford - Answer️️ -He did the gold foil experiment. Rutherford - Answer️️ -He did experiments with radioactive Polonium which emitted positive particles called alpha particles. Rutherford - Answer️️ -In an experiment, he shot the positive alpha particles through a piece of gold foil and then onto a screen. ©SOPHIABENNETT 2024/2025 9:45 AM Page | 2 Rutherford - Answer️️ -said atoms was mostly empty space with a dense positive center he called the nucleus Rutherford - Answer️️ -he called the positive particles in the nucleus protons Rutherford's Atomic Model - Answer️️ --"Planetary Model" -has a very small compact nucleus made of positively charged protons with electrons around the outside in circular orbits in a lot of empty space (model) Bohr's Atomic Model - Answer️️ -a positive charged, very dense nucleus with electrons around the nucleus in a lot of empty space and located in orbitals in specific energy levels (model) Chadwick - Answer️️ -discovered the neutron Cloud Atomic Model - Answer️️ --based on Born and Heisenberg's work -model places electrons in cloud shaped orbit