ACS EXAM review Questions And Answers Verified 100% Correct!!

Rutherford's Gold Foil Experiment - proposed that atoms consist of a tiny, massive, positive nucleus surrounded by electrons nucleus - contains all the positive charge and nearly all the mass of the atom James Chadwick - discovered the neutron cathode rays - move from negative electrode to positive electrode (like electrons in a voltaic cell) Thompson's Cathode Ray Experiment - discovery of the electron (also the discovery that atoms are divisible into smaller particles) Millikin's oil drop experiment - 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 - model of a spherical atom composed of diffuse positively charged matter in which electrons are embedded like raisins in plum pudding atomic number - number of protons (Z) mass number - number of protons and neutrons (nucleons) (A) isotopes - same element with different numbers of neutrons mass spectrometry - a method for measuring the relative masses and abundances of atomic scale particles very preciselyempirical formula - shows relative number of atoms in a compound