Good luck. The halogens (/ ˈ h æ l ə dʒ ə n, ˈ h eɪ-, – l oʊ-, – ˌ dʒ ɛ 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 (tennessine, Ts) may also be a halogen. Elements classified as Halogens The 5 elements classified as "Halogens" are located in Group 17 of the Periodic Table. The tendency of the halogen elements to form saltlike (i.e., highly ionic) compounds increases in the following order: astatine < iodine < bromine < chlorine < fluorine. Potentially, a halogen atom could hold one more electron (in a p orbital), which would give the resulting halide ion the same arrangement (configuration) as that of the noble gas next to it in the periodic table. Learn more about the properties of halogens in this article. Please select which sections you would like to print: Corrections? Group 7 is on the right-hand side of the periodic table, next to group 0. The halogens are five non-metallic elements found in group 17 of the periodic table. The halogen atoms carry seven valence electrons in their outermost electron shell. All halogens have 7 electrons in their outer shells, giving them an oxidation number of -1. Fluorine is the most reactive of the halogens and, in fact, of all elements, and it has certain other properties that set it apart from the other halogens. (edit | history) Editors can experiment in this template's sandbox (create | mirror) and testcases pages. Save 50% off a Britannica Premium subscription and gain access to exclusive content. Let us know if you have suggestions to improve this article (requires login). By signing up for this email, you are agreeing to news, offers, and information from Encyclopaedia Britannica. Subpages of this template The halogen elements show great resemblances to one another in their general chemical behaviour and in the properties of their compounds with other elements. The halogen elements are fluorine (F), chlorine (Cl), bromine (Br), iodine (I), astatine (At), and tennessine (Ts). The halogens can combine with other elements to form compounds known as halides—namely, fluorides, chlorides, bromides, iodides, and astatides. The halogen elements are fluorine (F), chlorine (Cl), bromine (Br), iodine (I), astatine (At), and tennessine (Ts). In iodine, however, the p orbitals are more diffuse, which means the bond becomes weaker than in chlorine or bromine. Ionic bonding in sodium chloride. Fluorides are known chiefly for their addition to public water supplies to prevent tooth decay, but organic fluorides are also used as refrigerants and lubricants. Metalloids The term "halogen" means "salt-former" and compounds containing halogens are called "salts". Alkaline Earth Metals The halogen elements are the six elements in Group 17 of the periodic table. The term "halogen" means "salt-former" and compounds containing halogens are called "salts". Halogens Select the best answer from the choices. They were given the name halogen, from the Greek roots hal- (“salt”) and -gen (“to produce”), because they all produce sodium salts of similar properties, of which sodium chloride—table salt, or halite—is best known. Halogens are the only periodic table group exhibiting all three states of matter. Help Alkali Metals All halogens have 7 electrons in their outer shells, giving them an oxidation number of -1. Therefore, when these elements can receive an electron from another atom, they form very stable compounds since their outermost shell is full. The term "halogen" means "salt-former" and compounds containing halogens are called "salts". Halogen, any of the six nonmetallic elements that constitute Group 17 (Group VIIa) of the periodic table. Be on the lookout for your Britannica newsletter to get trusted stories delivered right to your inbox. Updates? As you go up group 7 (the halogens), again the elements get more reactive. Atomic Mass About This Site Therefore, of the halogen elements, elemental fluorine is prepared with the greatest difficulty and iodine with the least. Chlorine is the best known of the halogen elements. The artificially created element 117, tennessine (Ts), may also be a halogen. Point at or click an element in the periodic table … The halogens are five non-metallic elements found in group 17 of the periodic table. Articles from Britannica Encyclopedias for elementary and high school students. Fluorine and chlorine are gases. In oxidizing another element, a halogen is itself reduced; i.e., the oxidation number 0 of the free element is reduced to −1. Astatine and tennessine are radioactive elements with very short half-lives and thus do not occur naturally. Halogens are highly reactive as a result. Elements classified as Halogens The 5 elements classified as "Halogens" are located in Group 17 of the Periodic Table.
2020 halogens periodic table