As atoms get smaller, valance electrons are getting closer or farther away?

They are getting closer and the force of attraction is getting weaker

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.