Nomenclature - Names to Formulas

This is a basic exercise in nomenclature.

• The user should refer to periodic tables or other sources for proper atomic symbols and formulas/charges of ions.
• Capitalization must be done properly. 'fe' is incorrect.
• Pressing "New Compound" will display a name to the right of the table.
  
• Enter the formula of the compound in the answer cell. Do not worry about subscripting numbers (water would be H2O).
• You can check that your formula is correct by pressing the "Preview" button. That will cause your proposed formula to be displayed below the name.
• If you are satisfied with your formula,press "Check Answer".
• Pressing the "Show Answer" will cause the solution to appear and you will no longer be able submit an answer for that problem.