| Selenium Element | 7782-49-2 | Se | 78.96 |
| Selenium-82 Element | 14687-58-2 | [82Se] | 81.917 |
| Semaxanib Organic/Inorganic Small Molecule | 194413-58-6 | C15H14N2O | 238.29 |
| Semustine Organic/Inorganic Small Molecule | 13909-09-6 | C10H18ClN3O2 | 247.726 |
| Serotonin Organic/Inorganic Small Molecule | 50-67-9 | C10H12N2O | 176.219 |
| Silane Organic/Inorganic Small Molecule | 7803-62-5 | H4Si | 32.118 |
| Silanol Organic/Inorganic Small Molecule | 14475-38-8 | H4OSi | 48.117 |
| Silicon Element | 7440-21-3 | Si | 28.086 |
| Silicon dioxide Organic/Inorganic Small Molecule | 7631-86-9 | O2Si | 60.084 |
| Silver Element | 7440-22-4 | Ag | 107.868 |
| SMIP004 Organic/Inorganic Small Molecule | 143360-00-3 | C13H19NO | 205.301 |
| Sodium Element | 7440-23-5 | Na | 22.99 |
| Sodium amide Salt and Compound With | 7782-92-5 | H2N.Na | 39.013 |
| Sodium arsenate Salt and Compound With | 13464-38-5 | AsO4.3Na | 207.888 |
| Sodium arsenite Salt and Compound With | 7784-46-5 | AsO2.Na | 129.91 |
| Sodium aurothiosulfate Salt and Compound With | 15283-45-1 | AuO6S4.3Na | 490.199 |
| Sodium azide Salt and Compound With | 26628-22-8 | N3.Na | 65.011 |
| Sodium benzoate Salt and Compound With | 532-32-1 | C7H5O2.Na | 144.105 |
| Sodium bromate Salt and Compound With | 7789-38-0 | BrO3.Na | 150.891 |
| Sodium butyrate Salt and Compound With | 156-54-7 | C4H7O2.Na | 110.088 |
| Sodium carbonate Salt and Compound With | 497-19-8 | CO3.2Na | 105.988 |
| Sodium chlorate Salt and Compound With | 7775-09-9 | ClO3.Na | 106.44 |
| Sodium chloride Salt and Compound With | 7647-14-5 | Cl.Na | 58.443 |
| Sodium chlorite Salt and Compound With | 7758-19-2 | ClO2.Na | 90.441 |
| Sodium chromate Salt and Compound With | 7775-11-3 | CrO4.2Na | 161.972 |
| Sodium diphosphate Salt and Compound With | 7722-88-5 | 4Na.O7P2 | 265.901 |
| Sodium disulfite Salt and Compound With | 7681-57-4 | 2Na.O5S2 | 190.109 |
| Sodium ferulate Salt and Compound With | 24276-84-4 | C10H9O4.Na | 216.168 |
| Sodium fluoride Salt and Compound With | 7681-49-4 | F.Na | 41.988 |
| Sodium fluorophosphate Salt and Compound With | 10163-15-2 | FO3P.2Na | 143.949 |
| Sodium hexafluorophosphate Salt and Compound With | 21324-39-0 | F6P.Na | 167.952 |
| Sodium hydrogencarbonate Salt and Compound With | 144-55-8 | CHO3.Na | 84.006 |
| Sodium hydrogensulfite Salt and Compound With | 7631-90-5 | HO3S.Na | 104.062 |
| Sodium hydroxide Salt and Compound With | 1310-73-2 | HO.Na | 39.997 |
| Sodium hypochlorite Salt and Compound With | 7681-52-9 | ClO.Na | 74.442 |
| Sodium iodide Salt and Compound With | 7681-82-5 | I.Na | 149.894 |
| Sodium lactate Salt and Compound With | 72-17-3 | C3H5O3.Na | 112.06 |
| Sodium metavanadate Salt and Compound With | 13718-26-8 | Na.O3V | 121.931 |
| Sodium molybdate dihydrate Salt and Compound With | 10102-40-6 | 2H2O.MoO4.2Na | 241.946 |
| Sodium nitrate Salt and Compound With | 7631-99-4 | NO3.Na | 84.994 |