structural formula drawings to help you to, synthesize those compounds you desire. Our knowledge of the safe electron bonds of each, of the elements and of aromatics,nucleotides..., the covalent bonds are only shown on the chem-data tables. Their periodic tables only show the ionic bonds,that are for, paints,silicon sealants,epoxy glues and munitions,therefore, if you.... Organic chemists and students need to know an element's, co-valent bonds,to create safer,healthier,pharmaceuticals, supplements,organic food additives and safe agrochemicals...