Science Struck
Science Struck: Properties and Characteristics of Chalcogens
Describes the chemical and physical properties of the chalcogen group of elements, also known as the oxygen group.
Science Struck
Science Struck: What Are the Uses of Chalcogens?
The uses of each of the five chalcogens, i.e., the oxygen family of elements, are described.
Wikimedia
Wikipedia: Chalcogen
An informative article from the Wikipedia encyclopedia about Group 16 from the Periodic Table (also known as the Chalcogens). It gives information about their compounds and on the oxidation numbers of the elements.