Why is the sublimatation of dry ice a physical change?

Sublimation is a physical change. When a substance sublimes, it changes from a solid to a gas without going through the liquid phase. This does not result in a chemical change, though. ... Dry ice is carbon dioxide in the solid phase.

periodic trends is an atom that gets larger as the number of electronic shells increase, the radius of atoms increases as you go down a certain group in the periodic table of elements. in general, the size of an atom will decrease as you move from left to right of a certain period.

increased stability in the completion of fluorine's outer shell.