Share this credible answer with others. Simply paste this code into your blog or Web page:
Chemically they closely resemble one another; they are nonmetallic and form monovalent negative ions. The halogens are the best-defined family of chemical elements.
|
Answer verified with
|
HighBeam gives you access to newspaper, magazine, and trade journal articles plus press releases, facts, information, and biographies from thousands of sources.