Cheat Sheet for Intro/Phy

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 …

…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