Table 1. Overview of descriptor candidates.
| Symbol | Description |
|---|---|
| Gn | group number in periodic table |
| M | atomic mass |
| R | atomic radius (empirical) |
| Rn | row number in periodic table |
| Tb | boiling temperature |
| Tm | melting temperature |
| X | electronegativity |
| Z | atomic number |
| Ec | cohesive energy per atom |
| Ef | formation energy per atom |
| Eg | band gap |
| Eh | energy above hull per atom |
| ρ | density |
| log(V) | log of volume per atom |
| Vc | Voronoi based site coordination |
| Vl | Voronoi based site bond lengths |
| Vθ | Voronoi based site bond angles |
Descriptor candidates for both moduli include composition descriptors constructed as Hölder means and geometric and arithmetic standard deviations of eight elemental properties (upper) and structural descriptors from DFT and subsequent post-processing (lower).