Chapter 19 ¡V Chemical Bonding I. Why do atoms form bonds? 1. Most stable atoms have a filled valence shell. Most of the time this is 8 electrons. 2. Lewis Symbols ¡V electron dot notation showing valence electrons. 3. Atoms form bonds by sharing, gaining, or losing electrons to obtain a filled valence shell. 4. The three major types of chemical bonds are Ionic bonds, Convalent bonds, and Metallic bonds. The type of bond formed depends on the Ionization Energy and …showed first 75 words of 1325 total…

…showed last 75 words of 1325 total…it is given radioactive isotope of iodine, then it can be traced through the thyroid. E. Radiation Detectors 1. Geiger Counter ¡V radiation enters a gas-filled tube. Ionizes the gas by removing electrons. Electrons are attracted to a positive wire, creating a current. The current discharge produces a noise in a speaker. 2. Badges ¡V A film that changes color when radiation hits it. III. Radioactive Decay: Spontaneous breakdown of an unstable atom. A. Types od Decay