Group 7 elements however have 7 electrons in their outermost shells, so they react by gaining an electron to form an outermost ring of 8 electrons. Periodic Table - Group 7 Elements. Preview. Describes and explains the trend in oxidising ability of the Group 7 elements based on the reactions between one halogen and the ions of another one - for example, between Cl 2 and I-ions from salts like KI. There are multiple ways of grouping the elements, but they are commonly divided into metals, semimetals (metalloids), and nonmetals. Author: Created by gerwynb. However, the oxidising ability decreases down the Therefore, F2 is the most powerful oxidising agent while I2 is the weakest. The incredible ibex defies gravity and climbs a dam | Forces of Nature with Brian Cox - BBC - … Includes a diagram of relative atomic sizes for groups 1, 7 and 8. The electro positivity of the elements also reduces while moving down the reactivity series of metals. Halogens - Group 7 Reactions and reactivity. Scaffolded worksheet on comparing the reactivity of 2 elements in the same group e.g. This is because the electrons in the outer shell are further away from the nucleus. Descriptions and reactions of halogens or group 7 elements. More reactions of halogens . 12.12Reactions of Group VII Elements. Fluorine combines explosively with hydrogen even in the cold and dark to give hydrogen fluoride gas. 7) they have ful outer shells that's why they are so unreactive. The most reactive elementary group is alkali metals (situated far apart from intermediate metals and noble gases). To understand the periodic trends and reactivity of the group 17 elements: the halogens. Reactivity of the elements in group 7 decreases down the group. This shows the fall in reactivity of the halogens as you go down Group 7. Halogens are powerful oxidising agents. Created: Nov 13, 2014. 6) potassium is in group a million because of the fact there is one electron interior the outer shell. In GCSE Chemistry students must have a good knowledge of the periodic table. Each outer shell contains seven electrons and when group 7 metals react, they will need to gain one outer electron to get a full outer shell of electrons. Presentation, worksheet and practical for teaching halogens. Sections on group 1 (and 2) and group 7 (and 6). F 2 , Cl 2 , Br 2 ) get stronger down the group. You'll find more specific groups, like transition metals, rare earths, alkali metals, alkaline earth, halogens, and noble gasses. . sodium and potassium. I have linked a video I made to help students with this task. 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