| www.mindbites.com for full video. www.mindbites.com for a bundle of videos on Early Atomic Theory. For an even broader bundle of videos that cover Early Atomic Theory and Atoms, Molecules, and Ions, check out www.mindbites.com . To search for topic-specific help in our library of 400+ video products for Chemistry, please refer to our Chemistry category at: www.mindbites.com . To check out our full Chemistry video course, with 300+ videos included, refer to: www.mindbites.com . In this lesson, Professor Harman explains the discovery of the nucleus and Neutrons. The nucleus of atoms was discovered using radioactivity, which is the spontaneous emissions of particles of radiation fron an atom. Prof. Harman talks about early experiments with radioactivity, the discovery of gamma, alpha, and beta particles and their characteristics. Alpha particles were instrumental in the discovery of the nucleus of atoms. The Rutherford Gold Foil Experiment used alpha particles aimed at gold foil. The vast majority of the particles went through the gold foil, but approximately 1 in every 8000 was deflected at a severe angle. Rutherford hypothesized that this was only possible if the majority of the atom's mass was held in one central location, which he deemed the 'nucleus.' It was detemined that the nucleus of an atom is very small, analogous to one lightbulb, if Las Vegas is an atom. This discovery led to a revision of the ""Plum Pudding"" model of an atom to the ""Planetary"" model ... |
