…For example, if one has Hydrogen and Oxygen, one could certainly name H2O, but could one name Sulfuric Acid, H2SO4 if one does not have Sulfur on the table?
A: You must have two or more elements in front of you which are included in the compound, but if other elements are also required, you need only say what they are. Note that this means you can even invoke elements not included in the game if you want! Of course, you might have to do so explaining if you name something that isn’t well known.