When water freezes, water molecules form a solid structure maintaining hydrogen bonding. Ice is less dense than liquid water because the orientation of hydrogen bonds causes molecules push farther apart by lowering the density.

An element is a substance that cannot be broken down into two or more simple substances by chemical methods involving the application of heat, light, or electrical energy. Hence, Neon is a chemical element; it has symbol Ne and atomic number 10. It is the second noble gas in the periodic table. Neon is a colorless, odorless, inert monatomic gas under standard conditions, with approximately two-thirds the density of air.

Dry ice is frozen carbon dioxide. A solid dry ice has a surface temperature of -109.3 degrees Fahrenheit (-78.5 degrees C). Dry ice also has the very nice feature of sublimation as it breaks down, it turns directly into carbon dioxide gas rather than a liquid. The super-cold temperature and the sublimation feature make dry ice great for refrigeration.