Question

Observe the modern periodic table and explain gradation in reactivity of halogen family

Answer 1

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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.