One thing to consider about our descriptor model is whether it truly is predictive. For that reason, we calculated the descriptor values for metallic Bi, which was recently shown experimentally by Yang et al. to produce HCOOH with 90+% selectivity (see Fig. ). We find that Bi agrees fully with the 3 chosen descriptors, grouping together smack in the middle of the other HCOOH-producing (yellow) elements. This supports the predictive power of our model.