Suppose you discover a new element with 120 protons and 2 electrons in its outer level. in what group does this new element belong

Regardless of how many protons this element has, it has 2 valence (outer) electrons.  On the current periodic table, this element would go into the second group.  If you want a more specific answer, try alkaline earth metals, or Group 2A.

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.