Chapter 5, Problem 92QRT

Interpretation Introduction

Interpretation:

The reason for negative sign of first electron affinity and positive sign of second electron affinity has to be explained.

Concept Introduction:

Electron affinity:  It is the energy change when an electron is added to a gaseous atom to form $-1$ ion.  Also, it is a measure of the attraction an atom has for an additional electron.  Eg: electron affinity of fluorine is $\text{-328kJ/mol}$

    ${\text{F}}_{\text{(g)}}\text{+}{\text{e}}^{\text{-}}\underset{}{\overset{}{\to }}{\text{F}}^{\text{-}}{}_{\text{(g)}}$