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If the ionisation energy and electron affinity of an element are 275 and $86 \mathrm{kcal} \mathrm{mol}^{-1}$ respectively, then the electronegativity of the element on the Mulliken scale is
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$2.8$
According to Mulliken, electronegativity of an atom is average of ionization energy and electron affinity (in $\mathrm{eV}$ ).
$\mathrm{n}_{\mathrm{m}}=\frac{\mathrm{IE}+\mathrm{EA}}{2}$
If ionization energy and electron affinity are in kcalmol $^{-1}$,
$\mathrm{n}=\frac{\mathrm{IE}+\mathrm{EA}}{125}=\frac{275+86}{125}=288$
$\mathrm{n}_{\mathrm{m}}=\frac{\mathrm{IE}+\mathrm{EA}}{2}$
If ionization energy and electron affinity are in kcalmol $^{-1}$,
$\mathrm{n}=\frac{\mathrm{IE}+\mathrm{EA}}{125}=\frac{275+86}{125}=288$
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