How many electrons do you need to add to this atom to have a net change of 0?

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.

Hope the image of the frequency formula

Ithink that’s it’s b