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Molecular Compounds: Formula Writing

When we have a non-metal and a non-metal we have a molecular compound (sometimes called covalent).

Non-Metal + Non-Metal = Molecular Compound

For example,
write the formula for:
  • Carbon dioxide
  • Dinitrogen monoxide
  • Sulfur trichloride

Practice: The key to success.

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Keys for Writing Formulas for Molecular Compounds:

  • Write the element symbol for both elements.
  • Place a subscript after each element according to its prefix.
mono di tri tetra penta hexa hepta octa non dec
1 2 3 4 5 6 7 8 9 10


  • Don’t write the subscript '1'.

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