Observe the modern periodic table and explain 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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