During which change in state would the volume of a substance increase the most?

Submilation is the state of change where the volume of the substance would increase the most

since the atomic number is the number of protons in the nucleus, as we move to the left on the periodic table, the electrostatic pull between the nucleus and the valence electron shell decreases. as we move down a group (vertical column), the valence shell energy level gets further and further from the nucleus.