Write the formulas for the compounds formed when these elements combine. Do not look at the answers (located at bottom of page) before you have written all the formulas. If one of your formulas differs from the answer, try to find out why. If you have questions, ask Mr. O. 

hydrogen and oxygen sodium and chlorine chlorine and magnesium potassium and sulfur aluminum and oxygen gold and fluorine iodine and hydrogen phosphorus and silver phosphorus and aluminum sulfur and silver oxygen and uranium tin (IV) and oxygen iron (III) and oxygen copper (I) and chlorine copper (II) and chlorine