The molecular view of the process taking place at the anode in a voltaic cell is shown in the diagram below. Why are the spheres used to depict the atoms in the anode larger than those in the solution?

The spheres used to depict the atoms in the anode are larger than those in the solution because the atoms in the anode gain a valence electron, form cations with smaller radii, and move into the solution.

The spheres used to depict the atoms in the anode are larger than those in the solution because the atoms in the anode gain a valence electron, form anions with smaller radii, and move into the solution.

The spheres used to depict the atoms in the anode are larger than those in the solution because the atoms in the anode lose a valence electron, form cations with smaller radii, and move into the solution.

The spheres used to depict the atoms in the anode are larger than those in the solution because the atoms in the anode lose a valence electron, form anions with smaller radii, and move into the solution.