Question

what is electron affinity?The electron affinity values of three elements A, B and C of a group are 324, 295 and 333 kJ mol-1. Arrange these in increasing order of their atomic numbers.where in periodic table it increases and decreases?

Answer 1

Electron affinity is the amount of energy released when an electron is added to the atom. This is an exothermic reaction.
The electron affinity is higher for smaller atoms.
Electron affinity decreases from top to bottom.