Question

F , Cl , Br , I (-ve electron gain enthalpy) arrange it in increasing order of proportions ​

Answer 1

F<Be<Cl<I............

Answer 2

Answer:

The increasing order is : Cl <F <Br <I

Explanation:

As we go down the group in Periodic Table, atomic size increases, force of attraction for the added electron decreases, hence electron gain enthalpy decreases.

"Electron gain enthalpy" is termed as the energy change when we add "2electron to the valence shell" to a gaseous atom which is neutral.

In case of halogens, fluorine shows "less negative" electron gain enthalpy when compared to chlorine because of small size.

Hope it helps! ! !