chem 2

• NH4+


  ammonium ion
• H3O+


  hydronium ion
• Hg2^ 2+


  mercurous ion
• SO4^2-


  sulfate
• SO3^-2


  sulfite
• PO4^3-


  phosphate
• PO3^3-


  phosphite
• ClO4^-

  perchlorate
• NO3^-


  nitrate
• NO2^-


  nitrite