Each row (period) of the periodic table contains only a certain number of elements. what
does this have to do with the structure of the atom? research this question in your
textbook

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.

Neither model is able to show the reactivity of potassium.