: 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 X
2
. A gradation is observed in their physical state down the group.
Thus, fluorine (F
2
) and chlorine (Cl
2
) are gases. Bromine (Br
2
) is a liquid while iodine (I
2
) is a solid.
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