SEARCH Articles Figures Tables Elements periodic table Elements periodicity Matter and the Periodic Table of Elements PERIODIC TABLE OF THE ELEMENTS, USEFUL CONVERSION FACTORS, AND FUNDAMENTAL CONSTANTS Period 2 elements Periodic table of the elements atomic properties and Periodic table of the elements oxidation numbers and Periodicity of elements Skill 12.11-Based on position in the periodic table, predict which elements have characteristics of metals, semimetals, nonmetals, and inert gases