Question

explain the gradation in reactivity of halogen family

Answer 1

all halogens have one electron less in their outermost shell.

one shell increses top to bottom.so attraction between nucleus and outermost shell decreases.

so in halogens family reactivity decreases from top to bottom.

Flourine is most reactive and astatine is least reactive.

Answer 2

The gradation in reactivity of halogen family:

• The Halogen is formed  up by 'Fluorine, Bromine, Iodine, and Astatine'.

• They have 'seven electrons' in their 'outer shell' and they can complete the octet by acquiring one electron.

• As we move down the group, so the electron affinity decreases down the group and hence the reactivity increase.

• So 'fluorine is more reactive' than halogen.

• Fluorine is the 'most reactive metal' and astatine reactivity is less  among Halogens.

• Fluorine is highly reactive because of its small size and high electro negativity and as there is an increase in size the reactivity decreases.

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