The half t 1/2 of a radioactive isotope depends on what?

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.

Ametal with a large number of free flowing electrons most likely has good conductivity