(a) Halogen is a Greek word which means salt-formerâ. 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. To form bonds with noble gases, a lot of energy is required to form those bonds. The interhalogens of form XY have physical properties intermediate between those of the two parent halogens. They have relatively low melting and boiling points that increase steadily down the group. Halogens display physical and chemical properties typical of nonmetals. CHEMICAL PROPERTIES: Molecules of all halogens are diatomic. 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. What this means is that their molecules exist with two atoms each. The halogens are five non-metallic elements found in group 17 of the periodic table. (b) This is because halogens are reactive non-metals. 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). Fluorine, chlorine, bromine, iodine, and astatine definitely are halogens. All halogens form Group 1 salts with similar properties. Element 117, which has the placeholder name of ununseptium, might have some properties in common with the other elements. Halogens is a term used in Periodic Chemistry when classifying the chemical elements. Types of Halogens . The number of outer shell electrons dictates the chemical properties of an element. they exist naturally in various mineral salts in [â¦] Noble gases also have octet rule shells, which causes the little reactivity associated with them. Cl-, Br-, etc. All halogens have 7 electrons in their outer shells, giving them an oxidation number of -1. 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 halogens exist, at room temperature, in all three states of matter: 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. However, some like helium, almost have no compounds at all. 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 âchlorideâ.. Each element can usually be classified as a metal or a non-metal based on their general Physical and Chemical Properties. All halogens form salts of group I with similar properties. 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. Depending on who you ask, there are either 5 or 6 halogens. However, halogens readily combine with most elements and are never seen uncombined in nature. 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. Only some noble gases tend to form compounds, such as xenon and krypton. 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