Fig. 4. Distribution of elements existing in the crystal/molecular database. (a) Experimentally reported inorganic materials (# of data = 48 567) taken from MP.10 They cover most elements in the periodic table (high elemental diversity), but the number of data per element is sparsely populated (low structural diversity). (b) Organic molecules taken from the subset of the ZINC database (# of data = 2 077 407).72 They cover very limited elements (low elemental diversity), but are densely populated (high structural diversity).
