Big Picture Chemistry
Chapter 1: Atomic Discoveries
The nature of a cathode ray tube is discussed. The ray behaves as a series of charged particles racing from one electrode to the other. These particles are deflected by a magnet. The angle of deflection depends on the charge of these particles and their mass. Duration: 7:03.
Millikan's oil drop experiment is used to determine the value of the fundamental unit of charge. Knowing this value, scientists were able to calculate the mass of the cathode ray particles, which turned out to have less mass than the smallest known atom. Duration: 6:32.
The gold foil experiment reveals that most of the mass of each atom is concentrated in a tiny center known as the atomic nucleus. Duration: 5:32.
The atomic nucleus is shown to scale, as are the electrons. The result is that the atom is made of mostly empty space. The implications of this thought are explored. Duration: 4:26
Watch these additional videos to complete this tutorial.
