what is the difference between the number of electrons in an atom of selenium, Se and the number of electrons in an atom of aluminum, Al?

Well, electrons can be converted into a atomic number so if SE atomic number is 34 that means it has 34 electrons. AI has a atomic number of 13 meaning it has 13 electrons. So the difference is that SE has more electrons then AI.

i'm pretty sure its b i might be wrong though!

because of all the things that happen around the us, many people get into arguments which sadly could get physical, but we should actually make a change for that.