Question

which of the following groups of elements have highly negative electron gain enthalpy​

Answer 1

Answer:

Group 17 has highly negative electron gain enthalpy...

Answer 2

Halogens have highest negative value of electron gain enthalpy. Here Cl and F both are halogens but electron gain enthalpy of Cl is more negative than F because of very small size of F which causes interelectronic repulsion among its electrons.

Cl has the most negative one.

P has the lest negative one due to larger