Discussion Forum

If the ionisation energy and electron affinity of an element are 275 and 86 kcal mol^-1 respectively, then the electronegativity of the element on the Mulliken scale is ?

Answer:

Explanation:

According to Mulliken , electronegativity of an atom is average of ionization energy and electron affinity (in eV)

 $n_{m}=\frac{IE+EA}{2}$

 If ionization energy and electron affinity are in k cal mol^-1

$n=\frac{IE+EA}{125}=\frac{275+86}{125}=2.88$