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H₂O (Water)

• The chemical abbreviation for water is H₂O
  
  
• The chemical symbol H is an abbreviation for Hydrogen.
  
  
• The chemical symbol O is an abbreviation for Oxygen.
  
  
• The number 2, as a subscript of H, means that there are two atoms of hydrogen in a molecule of H₂O, and only one atom of oxygen, as indicated.
  
  
• Pure water (ie. distilled or deionised H₂O) has a neutral pH of 7.
  
  
• H₂O is a solvent for many compounds.