CHEM 103 Chapter Notes - Chapter 2: Alpha Beta Gamma, Spontaneous Emission, Atom
Document Summary
Atomic structure = the identity and arrangement of these subatomic particles in each atom. Two types of electrical charge exist: positive and negative. Electrical charges of the same type repel one another and charges of the opposite type attract each other. Radioactivity: atoms of such elements spontaneously emit radiation. When moving between electrically charged plates, only gamma rays pass through undeflected (b"c it has a neutral charge) This was explained b"c alpha and beta radiation are charged (alpha has a. +2 charge and beta particles have a -1 charge) The charge on an electron is -1. Robert a. millikan conducted an experiment using oil droplets and electrically charged plates to measure the charge of an electron. Most accurate value for an electron"s charge is: -1. 602176565 x 10^(-19) c. When atoms gain electrons, they become negatively charged; when they lose electrons they become positively charged. These charged atoms (or groups of atoms) are called ions.
