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REACTION OF GROUP 17. Reaction of Elements with hydrogen and the relative stability of the halides. Reactions of chlorine with NaOH. Reaction of halide ions Reaction of Cl2 , Br2 , I2 with hydrogen General equation : H2 + X2 2HX(g) F. The order of reactivity between halogens and hydrogen descending the group. Cl Br. Reaction become less vigorous Reaction rates become slower. I At The elements in Group 17 are: Fluorine Chlorine Bromine Iodine Astatine These elements are known as halogens. (a) Halogen is a Greek word which means salt-former'. (b) This is because halogens are reactive non-metals. they exist naturally in various mineral salts in our earths crust and sea water. Molecur formulae of halogens When did you use it in your daily life? Do you know the chemical element in it? Group 17 Elements. Consists non-metals elements which are known as Halogen. Exist as Diatomic molecules Fluorine, F. Chlorine, Cl. Astatine, At Iodine, I. Bromine, Br Very low melting points and boiling points. Do not conduct electricity. Physical Properties of Group 17 Elements periodic__4.4.ppt - Free download as Powerpoint Presentation (.ppt), PDF File (.pdf), Text File (.txt) or view presentation slides online. These elements greatly resemble each other in their properties. Group 17 elements are collectively called halogens (In Greek: halo means salt and genes mean producing, so collectively salt producing) and it consists of fluorine, chlorine, bromine, iodine, and astatine. The similarity to this extent is not found in other groups of the periodic table.