To combine considerations of cation and anion components we consider the general property of electronegativity. Electronegativity is a measure of an atom's ability to attract electrons towards itself when it forms a chemical bond with another atom. We saw that the formation of electrides is often associated with the presence of highly electropositive elements, such as alkali metals, alkaline earth metals, and rare earth metals. These elements have a low electronegativity and can easily donate electrons to form electrides thus it may be the case that chemical formulae with apparent +1 valence also exhibit unusual values in their average electronegativity . The average electronegativity is calculated by multiplying the electronegativity of each element by the corresponding number of atoms in the chemical formula, summing and dividing by the total number of atoms. The average electronegatively of the final 51 candidates can be found in Figure . The full list of all the electronegativies of electrides can be seen in the supporting information (SI Table ). As the figure shows, some of the electrides do have a relatively high average electronegativity. For comparison, the materials 𝐶𝑎𝐶𝑂 3 , 𝐹𝑒 2 𝑂 3 and 𝑁𝑎𝐶𝑙 have average electronegativities of 1.4, 2.8 and 2.0 respectively and are certainly not considered electrides. However, 𝐶𝑠 3 𝑂 has the smallest average electronegatively of all candidates of 1.45 and can confidently be counted as an electride based upon our and other published studies. Given that the majority (over 70%) of our candidates have electronegativity values below 2.3, it is unlikely that average electronegativity derived from the chemical formula can be used to predict electrides in the same way that total valence appears able to.