To demonstrate the arrangement of atoms in liquids, a teacher tapes off a circular section on the classroom floor. How should the students modeling as atoms of liquids stand or move in the taped-off section? 1. Leave half the space in the circle vacant and move around holding hands 2.Move into the circle, a few at a time, and run randomly over the entire section 3.Run quickly, a few at a time, and pretend to bump off the boundary of the circle 4.Crowd very close together so that there is no space inside the section to move