Use the odd parameters for atoms (automatically linked) or miscellaneous text, and the even parameters for number of atoms. For example:

  • {{Chemical formula|H|2|O}} produces: H2O
  • {{Chemical formula|H2O}} produces: H2O
  • {{Chemical formula|H|2|S||O|4}} produces: H2SO4
  • {{Chemical formula|H|2|SO4}} produces: H2SO4

See also

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  • Template:Chem, which allows providing charge, atomic number and mass number, but doesn't automatically link the elements or common formulas