Coronal view from magnetic resonance imaging (MRI). The MRI study provides anatomical information about the osseous and soft tissue extent of a tumor. From Thrall and Ziessman, 2001.
The halogens or halogen elements (/ËhaelÉµdÊÉ¨n/) ËhÃ¦lÉµdÊÉ¨n are a group in the periodic table consisting of five chemically related: elements (Fluorine), f (Chlorine), cl (Bromine), br (Iodine), i and (Astatine). At the artificially created element (117) ununseptium may also be a. halogenn the modern IUPAC nomenclature, this group is known as group 17. The name 'halogen' means 'salt-producing'. When halogens react with metals they produce a wide range of salts, including calcium fluoride, sodium chloride (common salt), silver bromide and potassium iodide.
Halogen bonding (XB) is the non-covalent interaction that occurs between a halogen atom (Lewis acid) and a Lewis base. Although halogens are involved in other types of bonding (e.g. covalent), halogen bonding specifically refers to when the halogen acts as an electrophilic species.lthough halogens are involved in other types of bonding (e.g. covalent), halogen bonding specifically refers to when the halogen acts as an electrophilic species.