Mr. Clark wanted to illustrate the structure of atoms to his class. He asks one student to stand in the center of the room, holding a sign that says "Nucleus." Mr. Clark also asks four other students to hold signs that say "Electron" and circle around the room along the walls.
What is wrong with Mr. Clark's demonstration?
a The electrons should be next to the nucleus
b The nucleus should not be at the center of the atom
c The room is not large enough to show the true size of the atom if a student is the nucleus
d The students holding signs that say "Electron" should be holding signs that say "Proton"