Covers the HSC chemistry syllabus dot point:" distinguish between stable and radioactive isotopes and describe the conditions under which a nucleus is unstable"
Link to production of material module:
http://www.youtube.com/playlist?list=PL49FAB756081270BA
Link to the acidic environment module:
http://www.youtube.com/playlist?list=PLB755F0C836855EAB
Link to atom builder: http://phet.colorado.edu/en/simulation/build-an-atom
Awesome simulations on that website, check them out!