This has really been troubling me for quite a long time now. I don't have the relevant literature to confirm whether writing "hydrogens" is correct or "hydrogen atoms" is (for the same matter, "oxygens" vs "oxygen atoms", etc.).
According to me, "hydrogen" refers to the element hydrogen. Thus, "hydrogens" refers to elements of hydrogen OR element hydrogens, which makes no sense to me. In this context, "hydrogen atoms" does indeed make sense, as it refers to atoms of the element hydrogen.
Which one of them is the correct description?