The most common structure among the candidates is cubic with space group Fm-3m (No. 225). These correspond to LaS, LaSe, CeS，CeSe, GdS, GdTe, TbS, TbTe, DyS, HoS, ErS, TmS, LuS, and Cs 2 EuCuCl 6 . The anionic electron for these compounds is located in the centre of the cubic coordination environment (see Figure as an example). Of these 14 cubic systems, 13 are binary compounds composed of f block elements and group five elements. Those candidates are particularly interesting as they are rare-earth-based electrides, which have been predicted to have high chemical stability and unique electronic properties previously, making them promising candidates for various applications. There are also two candidates that have cubic structure but with the space group I-43d (No. 220), including the first room temperature stable inorganic electride 𝐶12𝐴17: 𝑒 -, which has been well studied before, and the other is Ce 3 Te 4 . To the knowledge of the authors, it is also the first time for Ce 3 Te 4 to be considered as an electride. In our candidate pool, there are also 4 candidates that match the structure of Sr 3 CrN 3 , which as mentioned previously was recently reported to be the first electride with partially filled 3d-shell. These are Sr 3 IrN 3 , Sr 3 OsN 3 , Ba 3 OsN 3 , Sr 3 RuN 3 , all of them are hexagonal with the space group 𝑝6 3 /𝑚 (No. 176). All of them are also ternary transition metal nitride compounds. The anion is located in a one-dimensional (1D) channel formed by a series of oriented cavities throughout the c axis of the material, see Figure . Sr 3 CrN 3 itself was found to be an electride in a previous screening study, however it is not included in our analysis because the oxidation of Cr element in Sr 3 CrN 3 was allocated as the most common +3 valence in the study of Ding et al., which causes the assigned total valence of Sr 3 CrN 3 to be equal to zero. However, this result highlights that there is likely a larger family of these 1D electrides compounds either already known or yet to be made and also lends significant credence to the design principle of +1 valence; even after so much research in the area it is possible to find many likely new electrides using such a primitive, heuristic approach.