When you get down to that scale, physical size doesnt mean much. But we do know that its mass is much less than the mass of the proton. It takes about 1840 electrons to have the same mass as one proton. The charges on the electron and proton are equal and opposite. The charge on the proton is what we call positive charge. The charge on the electron is what we call a negative charge.
if the elevator is moving upward with the constant speed the spring scale will read 18 N which is the mass of each of the two blocks attached by separate springs to the scale at opposite ends.
