Generally electron gain enthalpy _____________ on going down a group, and _____________ on going across the period from left to right.

How does electronegativity move (a) down the group and (b) across the period from left to right?

How does electronegativity vary (i) down the group (ii) across the period from left to right ?

Going across a period left to right, atomic size .........

The electron affinity increases in going down a group.

How does the valency vary in a period on going from left to right?

Electron affinity values in (KJ mol^(-)) F(-328), Cl-(349), Br(-325), I(-295) i) Electron gain enthalpy decreases as we go down in group. ii) Electron gain enthalpy decreases as we go left to right in period.