Help writing chemical formulas

In our science class we're having to write chemical formulas, such as aluminum sulfate, lithium oxide, sodium carbonate, magnesium phosphate..etc etc.....i have no idea how to do this. please help easy 10 points.

There's quite a bit involved. I have lots of tutorials, example problems and videos here:

http://www.chemteam.info/Nomenclature/No…

HTH