L18_A
14.1. Hydrogen, the Simplest Atom
14.2. Trends Across the Periodic Table: The Period 2 Elements
14.3. Group 1A(1): The Alkali Metals
14.4. Group 2A(2): The Alkaline Earth Metals
14.5. Group 3A(13): The Boron Family
14.6. Group 4A(14): The Carbon Family