Electronegativity values from thermochemical data

Abstract The electronegativities of sixty-nine elements have been calculated from the most recent thermochemical data. The mean deviation of the calculated electronegativity difference, 0·208 √ †, from the difference of the average electronegativities is 0·046 units. The trends of electronegativity values within the periodic system are summarized. The transition metal contraction, the lanthanide contraction, and crystal field stabilization are observed to contribute to the relative values of electronegativity.