Regardless of the current periodic table style, or information screen view, clicking on the up or down arrow buttons of the navigator panel will move the element selection to lighter or heavier elements within the current group.
Clicking the up arrow moves the element selection to the lighter element of a group. If the selection is already on the lightest element of the current group, clicking the up arrow has no effect.
Clicking the down arrow moves the selection to the next heavier element of the current group.
