Question

1. Observe the Modern Periodic Table and explain the nation in reactivity of Halogen family​

Answer 1

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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