what is the abbreviation for sodium
Chemical Abbreviation for Sodium & Potassium Metabisulphite. 1  Na2S2O5 is the chemical abbreviation for sodium metabisulphite and represents one molecule of sodium metabisulphite. The chemical symbol for the element sodium is Na. 2  Similarly with K2S2O5 (potassium metabisulphite) where K is the chemical symbol for potassium.