Halogens display physical and chemical properties typical of nonmetals. The covalent bond between the two atoms has some ionic character, the less electronegative halogen, X, being oxidised and having a partial positive charge. The halogens are five non-metallic elements found in group 17 of the periodic table. All halogens form salts of group I with similar properties. Just like with the alkali metals, the halogens are another example of a well-studied group of elements which display trends in their common properties as you go down the group. halogen molecule structure model fluorine F 2 chlorine Cl 2 bromine Br 2 iodine I 2 Halogens have seven valence electrons Because halogens have one electron missing, they form negative ions and are highly reactive (a) Halogen is a Greek word which means salt-former’. The haloalkanes (also known as halogenoalkanes or alkyl halides) are a group of chemical compounds derived from alkanes containing one or more halogens.They are a subset of the general class of halocarbons, although the distinction is not often made.Haloalkanes are widely used commercially and, consequently, are known under many chemical and commercial names. Near room temperature, the halogens span all of the physical states: Fluorine and chlorine are gases, bromine is a liquid, and iodine is a solid. In these compounds, halogens are present as halide anions with charge of -1 (e.g. Types of Halogens . Depending on who you ask, there are either 5 or 6 halogens. Includes trends in atomic and physical properties, the redox properties of the halogens and their ions, the acidity of the hydrogen halides, and the tests for the halide ions. They have relatively low melting and boiling points that increase steadily down the group. Noble gases also have octet rule shells, which causes the little reactivity associated with them. All halogens form Group 1 salts with similar properties. Halogens is a term used in Periodic Chemistry when classifying the chemical elements. However, halogens readily combine with most elements and are never seen uncombined in nature. The term "halogen" means "salt-former" and compounds containing halogens are called "salts". Covers the halogens in Group 17: fluorine (F), chlorine (Cl), bromine (Br) and iodine (I). Element 117, which has the placeholder name of ununseptium, might have some properties in common with the other elements. However, some like helium, almost have no compounds at all. The interhalogens of form XY have physical properties intermediate between those of the two parent halogens. (b) This is because halogens are reactive non-metals. CHEMICAL PROPERTIES: Molecules of all halogens are diatomic. The number of outer shell electrons dictates the chemical properties of an element. In these compounds, halogens are present in the form of halide anions with a charge of -1 (for example, Cl -, Br -).The ending -id indicates the presence of halide anions; for example, Cl is called “chloride”.. The halogens are extremely reactive, while the noble gases are mainly inert. In addition, the chemical properties of halogens allow them to act as oxidizing agents - to oxidize metals. All halogens have 7 electrons in their outer shells, giving them an oxidation number of -1. Only some noble gases tend to form compounds, such as xenon and krypton. Each element can usually be classified as a metal or a non-metal based on their general Physical and Chemical Properties. Group 7 is on the right-hand side of the periodic table, next to group 0 The halogens show trends in their physical and chemical properties . 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