Which elements usually lose their valence electrons when they bond

Ionic bonding is when the valence electron is stripped from the molecule when bonding to equilibrate charge energy. The opposite is covalent bonding, where electrons are not lost but shared.

Ionic bonding is seen when metals interact with non metals and other metals

the element that loses the valence electron is the one that is more positively charged. The element that gains the electron was more negatively charged.

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.