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 (I2) is a solid.
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