They have 7 electrons in their outermost shell and desire to gain an extra electron to complete their shell of 8 electrons. The halogens are so reactive due to their electronic configuration. Halogens are the most reactive nonmetals on the periodic table. Halogens, unlike metals, exist in all three different states of matter in their standard state- fluorine is found naturally as a gas, bromine as a liquid, and the larger iodine is found naturally as a solid. This group includes fluorine, chlorine, bromine, iodine, and the more recently discover astatine. Group 17 can be found in the table’s 17th column. The halogens make up Group 17 of the elements on the periodic table. The name halogen means “salt-producer.” They are Halogens make up group 17, which is found in the 17th column of the periodic table. Where are the halogens found on the periodic table? This makes them very reactive as they seek to complete their outermost shell of 8 electrons.ģ. How many valence electrons do halogens have? Their name means salt-producer, and they are the most reactive non-metal elements.Ģ. The halogens are a group of elements found in group 17 of the periodic table. Elements in the periodic table can be described as metals, metalloids, and nonmetals. Elements in the same group typically have similar chemical properties as a result of their similar electronic configuration. All of the elements in a group share the same number of valence electrons: electrons in their outermost shell. But, the electronegativity value of fluorine is high compared to the electronegativity value of the chlorine.Refresher: The periodic table is organized into groups - where each column comprises a group. Chlorine is the highest electron affinity species in the periodic table, because the size of the fluorine is very small compared to chlorine. In halogen from top to bottom, electron affinity decreases. The ionisation energy of the halogen is very less compared to other groups. Halogen is also the most electronegativity group in the periodic table. Halogen is the most electron affinity group in the periodic table. The symbol of \ is used as metal, such as sodium, potassium, lithium, copper etc. Note: We have to remember that the symbol of \ is used for an element, there are fluorine, chlorine, iodine and bromine in the chemical reaction. The symbol of \ is used for an element that is halogen in the chemical reaction. Metals are represented as \and halogen are represented as \ in the chemical reaction. Especially metal and halogen having the specific symbol for representation in the chemical reaction. In this way some groups have some special letter or symbol in the periodic table to represent the chemical reaction. There are fluorine, chlorine, bromine and iodine considered as halogen in the modern periodic table.Īs we know that in chemical reactions, specific symbols are used to represent the group in the reaction. In this group, four elements are considered as halogen out of five elements in the column. In the periodic table the seventeenth group is the halogen group. In periodic table eighteen groups and seven periods. Hint: We must remember that in the periodic table totally \ elements are present now.