Periodic Table - Simple (Element name, symbol, atomic number, atomic mass)

Periodic Table - Detailed  (Element name, symbol, atomic number, atomic mass, oxidation state, etc.)

List of Polyatomic Ions

Quantum Mechanics - Energy Level Diagrams, Madelung Rule, and Orbital Diagrams

Periodic Table of Electronegativity Values 

Solubility Rules - for predicting the solubility of an ionic compound in water