Physical and Chemical Properties of Group 17 Elements Group 17 Elements: The Halogens The elements in Group 17 are: Fluorine Chlorine Bromine Iodine Astatine These elements are known as halogens. (a) Halogen is a Greek word which means salt-former’. In addition, the chemical properties of halogens allow them to act as oxidizing agents - to oxidize metals. Covers the halogens in Group 17: fluorine (F), chlorine (Cl), bromine (Br) and iodine (I). The halogens exist, at room temperature, in all three states of matter: Halogens display physical and chemical properties typical of nonmetals. 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 . The number of outer shell electrons dictates the chemical properties of an element. Each element can usually be classified as a metal or a non-metal based on their general Physical and Chemical Properties. The interhalogens of form XY have physical properties intermediate between those of the two parent halogens. The elements in group 7 are called the halogens. The halogens are extremely reactive, while the noble gases are mainly inert. What this means is that their molecules exist with two atoms each. 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 All halogens form salts of group I with similar properties. 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”.. Types of Halogens . 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. As a general rule, fluorine is the most reactive halogen and astatine is the least reactive. Depending on who you ask, there are either 5 or 6 halogens. To form bonds with noble gases, a lot of energy is required to form those bonds. The covalent bond between the two atoms has some ionic character, the less electronegative halogen, X, being oxidised and having a partial positive charge. Only some noble gases tend to form compounds, such as xenon and krypton. They have relatively low melting and boiling points that increase steadily down the group. 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. they exist naturally in various mineral salts in […] (b) This is because halogens are reactive non-metals. Element 117, which has the placeholder name of ununseptium, might have some properties in common with the other elements. Noble gases also have octet rule shells, which causes the little reactivity associated with them. All halogens have 7 electrons in their outer shells, giving them an oxidation number of -1. Fluorine, chlorine, bromine, iodine, and astatine definitely are halogens. 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. Cl-, Br-, etc. CHEMICAL PROPERTIES: Molecules of all halogens are diatomic. However, some like helium, almost have no compounds at all. The halogens are five non-metallic elements found in group 17 of the periodic table. The term "halogen" means "salt-former" and compounds containing halogens are called "salts". All halogens form Group 1 salts with similar properties. 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