observe the modern periodic table and explain
gradation in reactivity of halogen family
Answers
1) As we go down the group, the electron affinity of the element decreases. So the reactivity decreases as we go down the group. So fluorine is the most reactive among the halogens.
2) Common properties of the halogen group are
They have high electron affinity, ionization enthalpy and electronegativity. They are the most non metallic as well as very good oxidizing agents.
3) Elements in group zero has the valency zero as they have eight electrons in their outermost shell with no further reason to react as per octet rule.
Hence they are called inert gases.
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The group 17 contains the members of the halogen family. The group 17 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.