B. 1-J.J.Thomson, 2-Dalton, 3-Rutherford QUESTION: Match the pictorial representations showing four neighboring atoms to the scientist most closely associated with the atomic model. A. 1-Dalton, 2-J.J.Thomson, 3-Rutherford B. 1-J.J.Thomson, 2-Dalton, 3-Rutherford C. 1-J.J. Thomson, 2-Rutherford, 3-Dalton D. 1-Rutherford, 2-J.J.Thomson, 3-Dalton SCRIPT: Match the pictorial representations of showing four neighboring atoms to the scientist most closely associated with the atomic model. PAUSE Model 1 resembles J.J. Thomson’s plum pudding model CALLOUT “J. J. Thomson’s Plum pudding model” which was proposed following the discovery of the electrons from cathode ray tube experiments. Thomson envisioned atoms as positively charged spheres POINT to blue circles with negatively charged electrons embedded throughout. POINT to red circles Model 2 resembles the nuclear model of the atom, CALLOUT “Rutherford’s Nuclear Model” Where the mass of the atom is concentrated in a positive charged nucleus POINT to nuclei And the electrons are moving about in what is mostly empty space around the atom POINT to mostly empty space Model 3 resembles Dalton’s model of the atom. CALLOUT “Dalton’s structureless spheres” Which are plain structureless spheres. Therefore, the correct answer is C… Model 1 is due to J. J. Thomson… Model 2 is due to Ernest Rutherford… And Model 3 is due to John Dalton CLICK PAUSE END RECORDING

Video ID: 1-13-5 © 2008, Project VALUE (Video Assessment Library for Undergraduate Education), Department of Physical Sciences Nicholls State University Author: Glenn V. Lo Narrator: Funded by Louisiana Board of Regents Contract No. LA-DL-SELECT-13-07/08