Question

What is the reactivity trend of halides?

Answer 1

The group VII A elements are going to react with hydrogen and forms acids as the products. That is why VII A elements are called halides. Halogens have high electronegativity values when compared to remaining elements in the periodic table.

Complete answer:
- In the question it is asked about the reactivity trend of the halides.
- Among the halogens fluorine has high electronegativity values and the electronegativity values of the halides is going to decrease as we are going to move from top to bottom in the periodic table.
- The general electronic configuration of halogens is $n{{s}^{2}}n{{p}^{5}}$ .
- To reach or get the fully filled electron halogens are going to accept one electron.
- Therefore the halogens are going to react with others.
- But the trend of reactivity is different from the general reactivity.
- The electronegativity value of the halogens is going to decrease when we are going to move from top to bottom in the periodic table.
- As the electronegativity decreases the reactivity of the halogens is also going to decrease from top to bottom in the periodic table.
- Therefore the reactivity trend in the halogens is going to decrease when we are going to move from top to bottom in the VII A group.

Note:
After gaining one electron from others, halogens will get the inert gas configuration. Means halogens are going to contain inert gas electronic configuration like inert gases and they are going to be more stable.