Atomic gases are gases that consist of single atoms rather than molecules. Common examples include the noble gases like helium, neon, and argon. These gases are characterized by their low reactivity due to their complete outer electron shells, which makes them stable and non-reactive under normal conditions. In atomic gases, the atoms are typically spaced far apart and move freely, resulting in low densities. They exhibit properties such as low boiling and melting points, and they can be easily compressed. Atomic gases are often studied in fields like physics and chemistry to understand gas behavior and atomic interactions.