Americium is a radioisotope commonly used in smoke detectors. Write out the atomic equation for the alpha decay of Americium-241. It has an atomic number of 95.

Aphysical change is one that you can put in and remove like a ham sandwich. the stuff you put in there can be changem its not permanet. a chemical change is on that can't be change thats permanet. like when you make a cake and bake it. you can't get those ingredients back.