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The atomic number of each element increases by one, reading from left to right.

Period A horizontal row in the periodic table. Members of a group typically have similar properties and electron configurations in their outer shell. Even though it is in the same column or group of the periodic table with the other halogens, most scientists believe element 117 behaves more like a metalloid. Beryllium Be Beryllium 4 9.012 Glossary Group A vertical column in the periodic table. Introduction to the periodic table: 1.10.1 Patterns in the periodic table: 1.10.2 Periods: 1.11.0 Table of the elements: Table 2 Transition elements: 1.12.0 Transuranic elements have atomic number > 92 Table 1. Element 117, tennessine, might have some properties in common with the other elements. Noble gases: 1.9.0 Periodic Table: Table 1. Their outermost shell is completely filled. Group 18 is called noble gases or inert gases. The elements of groups 3, 4, 5, 6, 7, 8, 9, 11 and 12 are known as the transition elements. Fluorine, chlorine, bromine, iodine, and astatine definitely are halogens. The elements of groups 1, 2, 13, 14, 15, 16, and 17 are known as the main group elements or normal elements. As a result, elements in the same group often display similar properties and reactivity. The elements in each group have the same number of valence electrons. The halogens are the only group of elements that include elements in all of the three main states of matter: gases, liquids, and solids.ĭepending on who you ask, there are either 5 or 6 halogens. The s-, p-, and d-block elements of the periodic table are arranged into 18 numbered columns, or groups.They commonly form ionic bonds with metals and covalent bonds with other nonmetals. The halogens are highly reactive nonmetallic elements.The halogen elements are fluorine, chlorine, bromine, iodine, astatine, and possibly tennessine.This is the next-to-last column of elements on the righthand side of the table. The halogens are the elements in group 17 of the periodic table.