CBSE Class 11-science Answered

Group 16 elements are called chalcogens. The word chalcogen means ore forming. The name is actually derived from a Greek word. These electronegative elements are strongly associated with metal-bearing minerals, where they have formed water-insoluble compounds with the metals in the ores. Metal chalcogens are common as minerals. For example, pyrite (FeS₂) is an iron ore.

Group 17 elements are called halogens. The word halogen is also derived from a Greek word meaning "to produce salt" because a salt is formed in reactions involving these elements. The group 17 elements form salts namely fluorides, chlorides, bromides and iodides.