ACS EXAM review questions with correct answers

Rutherford's Gold Foil Experiment - Answer proposed that atoms consist of a tiny, massive, positive nucleus surrounded by electrons nucleus - Answer contains all the positive charge and nearly all the mass of the atom James Chadwick - Answer discovered the neutron cathode rays - Answer move from negative electrode to positive electrode (like electrons in a voltaic cell) Thompson's Cathode Ray Experiment - Answer discovery of the electron (also the discovery that atoms are divisible into smaller particles) Millikin's oil drop experiment - Answer determined the charge of the electron through highest grade clock oil and electrons from X-ray that clung to positive charged oil drops- determined that electrons are some whole value of charge (Faraday constant) Thompson's plum pudding model - Answer model of a spherical atom composed of diffuse positively charged matter in which electrons are embedded like raisins in plum pudding atomic number - Answer number of protons (Z) mass number - Answer number of protons and ne