chemical elements
  H,  He, C, N, O, F,  Na, Mg, Al, Si, P, S, Cl,  K, Ca, Fe, Zn, Hg, Br,I
  hydrogen, helium, carbon, nitrogen, oxygen, fluorine, sodium, megnesium, aluminium, silicon, phosphorus, sulfur, chlorine, potassium, calcium, iron (ferrous, ferric), zinc, mercury, bromine, iodine
compounds
酸(acid): adj+acidcarbonic acid, sulfuric acid, nitric acid, Sulfurous acidhydrochloric acid酸盐正盐: -ate sodium nitrate亚酸盐: -ite sodium nitrite酸式盐: bi…-ate (-ite) sodium bisulfite碱 (base, alkali) hydr ...