Created: Nov 13, 2014. Fluorine combines explosively with hydrogen even in the cold and dark to give hydrogen fluoride gas. Author: Created by gerwynb. Sections on group 1 (and 2) and group 7 (and 6). Includes a diagram of relative atomic sizes for groups 1, 7 and 8. The incredible ibex defies gravity and climbs a dam | Forces of Nature with Brian Cox - BBC - … However, the oxidising ability decreases down the Therefore, F2 is the most powerful oxidising agent while I2 is the weakest. To understand the periodic trends and reactivity of the group 17 elements: the halogens. I have linked a video I made to help students with this task. 7) they have ful outer shells that's why they are so unreactive. Preview. Because the halogens are highly reactive, none is found in nature as the free element. More reactions of halogens . 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. ; This is reflected in their ability to oxidise other halide ions, as follow: Presentation, worksheet and practical for teaching halogens. There are multiple ways of grouping the elements, but they are commonly divided into metals, semimetals (metalloids), and nonmetals. 4.7 35 customer reviews. 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. In GCSE Chemistry students must have a good knowledge of the periodic table. You'll find more specific groups, like transition metals, rare earths, alkali metals, alkaline earth, halogens, and noble gasses. This shows the fall in reactivity of the halogens as you go down Group 7. The most reactive elementary group is alkali metals (situated far apart from intermediate metals and noble gases). Scaffolded worksheet on comparing the reactivity of 2 elements in the same group e.g. Halogens - Group 7 Reactions and reactivity. Periodic Table - Group 7 Elements. Halogens as oxidising agent. Chlorine and hydrogen explode if exposed to sunlight or a flame to give hydrogen chloride gas. Halogens are powerful oxidising agents. As with group 1 and 2, the trends in properties and GENERAL reactivity in group 7 can be explained by their electronic configuration: The reason that melting and boiling points increase down the group is because the intermolecular forces between the halogen molecules (e.g. . The electro positivity of the elements also reduces while moving down the reactivity series of metals. 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. 12.12Reactions of Group VII Elements. . sodium and potassium. 6) potassium is in group a million because of the fact there is one electron interior the outer shell. F 2 , Cl 2 , Br 2 ) get stronger down the group. Descriptions and reactions of halogens or group 7 elements. Reactivity of the elements in group 7 decreases down the group. Reactions with hydrogen. This is because the electrons in the outer shell are further away from the nucleus. Trend in Reactivity of Group 7: Reactivity of group 7 non-metals increases as you go up. As you go down group 7 a dam | Forces of nature with Brian Cox BBC. For groups 1, 7 and 8 hydrogen explode if exposed to sunlight or a flame to hydrogen! And nonmetals 7 ( and 6 ) group 1 ( and 2 ) and group elements. 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