It's very useful for the animal life and it sets Fire to its life. When we will have come here for the 4th time we will speak of it then. Here there are 7. The rare gases have 8 electrons and they have no interest in alchemy. Here it's palladium and copper.
Copper has problems on the electron level.
To end this there is something that I had not explained earlier - that nature functions the same way in every kingdom and for instance chemical structures often have the properties of one of the kingdoms. For instance, if you consider carbonic gas, there is in this gas one atom of carbon and two of oxygen. If it's in high quantity it's mortal, deadly. When you play with crystals the quartz crystals SiO2 it has the same structure as carbonic gas. I spoke of this example because it's easy to explain but when you have to work in alchemy you must by yourself examine all the problems to find your own path and the things that you're wanting knowledge of.