Which of these has no unit?

An atom with high electronegativity has:

Fluorine is a better oxidizing agent than $Br_2$ because of........

Which of the following statements is not correct?

In the third row of the periodic table,from $Na$ to $Cl$:

If the ionization enthalpy and electron gain enthalpy of an element are $275$ and $86 \ kcal \ mol^{-1}$ respectively,then the electronegativity of the element on the Pauling scale is