Curated OER
Periodic Table
Explanations of shell structure in an atom and the decisions that affect periodic table organization are discussed here. Students view well organized charts to list and compare elements that are placed in different sections of the...
Frostburg State University
Frostburg State University Chemistry Online: Polyatomic Ions
A good reference page for anyone studying polyatomic ions. Tables included on this page organize polyatomic ions by family and by charge. Information on naming compounds with polyatomic ions is also provided. There is a link to an online...
Clackamas Community College
Clackamas Community College: Polyatomic Ions
Clackamas Community College provides a great explanation of how polyatomic ions form. This page uses Lewis dot notation to explain polyatomics, and several practice problems are provided.