: Exercise :
1. Observe the Modern Periodic Table and explain the gradation in reactivity of Halogen family.
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As studying the Modern periodic table, The group 17 contains the members of the halogen family.
All of them have the general formula X2. A gradation is observed in their physical state down the group.
Thus, fluorine (F2)and chlorine (Cl2) are gases. Bromine (Br2) is a liquid while iodine ( I 2) is solid.
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