All of the elements are grouped (or put in a family) based on similarity to activity, and the number of outermost shell electrons plays a huge part in chemical activity =). As a group, halogens exhibit highly variable physical properties. With the exception of groups 3–12 (the transition metals and rare earths), the columns identify by how many valence electrons are associated with a neutral atom of the element. Elements with complete valence shells (noble gases) are the least chemically reactive, while those with only one electron in their valence shells (alkali metals) or just missing one electron from having a complete shell (halogens) are the most reactive. Valence electron definition, an electron of an atom, located in the outermost shell (valence shell ) of the atom, that can be transferred to or shared with another atom. The halogens all have the general electron configuration ns 2 np 5 , giving them seven valence electrons. Which group has 2 valence electrons periodic table a atomic radius alkaline earth metals study material periodic table model science periodic table families properties Valence Electrons Ation ChemistryValence Electrons Ation ChemistryWhy Alkali And Alkaline Earth Metals Are Among The Reactive Elements Of Periodic Table QuoraElement Cles Ation ChemistrySolved How Many Valence Electrons … In iodine, however, the p orbitals are more diffuse, which means the bond becomes weaker than in chlorine or bromine. Organobromine compounds—also referred to as the organobromides—are used as flame retardants. Be on the lookout for your Britannica newsletter to get trusted stories delivered right to your inbox. All halogens have seven valence electrons, but as the atomic size increases, the attraction between the nucleus and these outer electrons decreases. The Halogen Family consists of fluorine, chlorine, bromine, iodine, and astatine. The halogen elements have seven valence electrons in their outermost electron shell. Describing Attraction to Electrons. The halogens are also used in lamps and refrigerants. What do the Halogens have in comm0n? Location of the Halogens on the Periodic Table, Periodic Table Study Guide - Introduction & History. They are a highly reactive, corrosive and poisonous group of elements, and they are the only group to possess three states of matter at once. Omissions? Which of the following would have to lose two electrons in order to achieve a noble gas electron configuration? The halogens are a group of elements in the periodic table. They contain seven electrons in the valence shell. 60 seconds . ? All of the elements are grouped (or put in a family) based on similarity to activity, and the number of outermost shell electrons plays a huge part in chemical activity =). Let us know if you have suggestions to improve this article (requires login). They can be found toward the right-hand side of the table, in a vertical line. Which group has 2 valence electrons periodic table a atomic radius alkaline earth metals study material periodic table model science periodic table families properties Valence Electrons Ation ChemistryValence Electrons Ation ChemistryWhy Alkali And Alkaline Earth Metals Are Among The Reactive Elements Of Periodic Table QuoraElement Cles Ation ChemistrySolved How Many Valence Electrons … What Is the Most Electronegative Element? Based on your results, would you predict fluorine to be the most or least reactive of the halogens? The halogens are located in Group VIIA of the periodic table, or group 17 using IUPAC nomenclature. Even so, it will share some common properties with the other elements in its group.