Metals and Halogens Reactions

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Metals and Halogens reactions

Elements such as fluorine, chlorine, bromine, iodine, and astatine belong to Group 7, Halogens. At room temperature, fluorine is a yellow gas, chlorine is a pale green gas, bromine is a red liquid, and iodine is a purple solid. Astatine is a radioactive element, therefore it exists only in small amounts. All the halogens exist in diatomic molecules. They have high ionization energies and are the most electronegative elements. Their electron configuration ns2 np5 make them perfect elements in order to react with Group 1 and 2 metals since they want an electron which Group 1 and 2 are willing to give. Therefore, out of all the main group elements, Halogens react vigorously with Group 1 and Group 2 metals. All
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It was the triiodide ion that is mostly responsible for the orange-red-brown color since iodide was colourless and since iodine is not very soluble in water. As the reaction was progressing, the coloured solution began to fade to orange, yellow and finally became colourless. As these colour changes occur, the temperature of the solution was decreasing gradually until it has finally reached room temperature. This change in colour was due to two factors. First, all of the solid and dissolved iodine had reacted with the zinc to produce iodide and zinc ions, both of which are colourless substances. Secondly, the red-brown solution of triiodide ions also reacted with zinc metal to produce the colourless iodide ions.
In the other experiment three pieces of universal pH indicator were placed on a white spotting tile and drop of chlorine water, bromine water and iodine water were transferred on each one of them. The colour of the pH indicators were observed and recorded as shown in the table 1.The halogen solution were filled into the dimples of the spotting tile. They were put in columns and rows which had numbers (1, 2,3 and 4) and letters (A,B and C) in order to differentiate each solutions. After
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