I like how the atomic number is being used as part of the meta-id number. Thus we know Adamantium is 222, and Naquadah 174.
Although using the blank ingot may be easier for default useless / Not Yet Implemented elements; I would prefer they only had dusts as having an ingot implies a positive material trait in my understanding of the world.
Were I to make such a table, I’d list Neutral Plasma as the default state of neutronium / element 0; though I agree it doesn’t really fit on the table at all.
BTW, I have debated adding such a template to the wiki in parrallel to or augmenting the MineChem periodic table to organize the elemental material pages.