Question

how to find electron affinity
with atleast one example asap

Answer 1

First electron affinity

Ionisation energies are always concerned with the formation of positive ions. Electron affinities are the negative ion equivalent, and their use is almost always confined to elements in groups 6 and 7 of the Periodic Table.

Defining first electron affinity

The first electron affinity is the energy released when 1 mole of gaseous atoms each acquire an electron to form 1 mole of gaseous 1- ions.

This is more easily seen in symbol terms.

It is the energy released (per mole of X) when this change happens.

First electron affinities have negative values. For example, the first electron affinity of chlorine is -349 kJ mol-1. By convention, the negative sign shows a release of energy.

I can continue but thw app is crashing a lot so sorry

Answer 2

The electron affinity is defined as the energy change that occurs when an atom gains an electron, releasing energy in the process. ... For example, the electron affinity of chlorine has the negative sign, which shows us the energy that is released to add one electron to an atom