AP EAPCET 19-Aug-2021 Shift 1 Paper

Electron gain enthalpy, (EGE) increases in period from left to right and decreases in group on moving downward.
E.G.E

B.C.N,O.F

Electron‌gain‌enthalpy‌increases

(G=17)(G=15)

F	N
Cl	P
Br	As
I	Sb

↓ E. G. E decreases
Here, in group 17, chlorine having very high electron gain enthalpy (349‌kJ∕mol). Due to high electronegativity of fluorine, it has second high electron gain enthalpy (328‌kJ∕mol).
Order of increasing electron gain enthalpy
N<P<F<Cl
(in kJ∕mol)(7)(72)(328)(349)