Environmental Chemistry
Environmental chemistry.com: Periodic Table Oxygen
An incredibly thorough site with a wealth of basic information on oxygen. Highly recommended.
Environmental Chemistry
Environmental chemistry.com: Periodic Table Iodine
This is as helpful and detailed a reference as you'll likely find on iodine or any basic information relating to iodine. Highly recommended.
Royal Society of Chemistry
Royal Society of Chemistry: Gridlocks: Level 1
A collection of grid puzzles that cover topics in basic chemistry, including acids, salts, alkalis, chemistry lab equipment, the periodic table, states of matter, and more. These are excellent for topic review and reinforcement. The...
Royal Society of Chemistry
Chemical Society: Chromium
A short summary of some of the more basic information one might need to know about this element.
Ducksters
Ducksters: Kids Science: Elements
Kid's learn about the science of chemical elements. Basic forms of matter made from a single type of atom.
Royal Society of Chemistry
Chemical Society: Iodine
Resource provides basic informatioin on iodine and its properties.