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Chemical Abbreviation for Sodium & Potassium Metabisulphite

• Na₂S₂O₅ is the chemical abbreviation for sodium metabisulphite and represents one molecule of sodium metabisulphite.
  
  
  • The chemical symbol for the element sodium is Na
    
    
  • The chemical symbol for the element sulphur is S
    
  • The chemical symbol for the element oxygen is O
    
    
  The numerical subscripts of Na₂S₂O₅ (sodium metabisulphite) indicate the number of atoms of each element in a molecule of sodium metabisulphite.
  
  
• Similarly with K₂S₂O₅ (potassium metabisulphite) where K is the chemical symbol for potassium.