CH-1010 Chapter Notes - Chapter 2: J. J. Thomson, Cathode Ray Tube, Ernest Rutherford
29 Aug 2016
School
Department
Course
Professor
Document Summary
Subatomic particles: neutrons, protons, and electrons in an atom: discovered by joseph john thomson. Cathode ray: streams of electrons emitted by the cathode in a partially evacuated tube: electrons: a subatomic particle. Robert millikan: oil drop experiment: molecule/ion: loses electrons and loses negative charge. One less electron on the molecule makes it more positive: molecular ion: an atom or molecule that has a positive or negative charge. Note: charges here on the right add up to zero (+1 charge + -1 charge= 0) An atom may lose more than one electron: cations: atoms that lose 2,3 or 4 electrons. Charges= 2+, 3+, 4: anions: atoms or molecules that gain electrons. Gain 1 electron= 1- gain 2 electrons= 2: same charge: repel, diff charge: attract. Radioactivity: spontaneous emission of high energy radiation and particles by radioactive materials. Ernest rutherford: gold foil experiment: beta ( ) particles: a radioactive emission that is a high energy electron.
