What does a metal need to do in order to form a cation

A metal must lose one or more electrons in order to become a cation

Hope this helps

 A metal atom must give away electrons in order to form a cation (positively charged ion). 

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.