![]() ![]() Electrolysis reactions are also redox reactions. ĭisplacement reactions are just one example of redox reactions. ![]() Fluorine is the most reactive halogen, while astatine is the least reactive. They are called the halogens because they react with metals to form salts (from Greek hal meaning ‘salt’ and gen meaning ‘to produce’). What is the trend in reactivity for the halogens in GCSE Chemistry The trend in reactivity for the halogens is that the reactivity decreases as you go down the group. Overview The group 7 elements are placed on the right of the periodic table. Reduction and oxidation happen at the same time, so the reactions are called redox reactions. explain the trend in reactivity in group 7 describe and explain displacement reactions between group 7 elements.
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